How Many Lands Do You Need in MTG? Frank Karsten Mana Math Explained

Your mana base is the foundation of every Magic: The Gathering deck. It determines whether you cast your spells on curve or spend critical turns doing nothing. Get it wrong, and even a deck full of powerful cards will lose to itself. This guide explains the math behind building an optimal mana base, from total land count to colored source requirements, using the research of Pro Tour Hall of Famer Frank Karsten.

If you want to skip the theory and get recommendations for your deck right now, use our Mana Base Calculator — it implements everything in this guide automatically.

Frank Karsten's Mana Math: The Gold Standard

Frank Karsten is a Pro Tour Hall of Famer, mathematician, and the author of the most cited mana base research in competitive Magic. His work uses hypergeometric probability — the math of drawing specific cards from a deck without replacement — to calculate exactly how many colored mana sources you need to consistently cast your spells on curve.

The core question Karsten answers: "How many sources of a color do I need in my 60-card deck to cast a spell with N colored pips on turn T with at least 90% probability?"

His research produces concrete, actionable numbers. No guesswork, no "it feels about right" — just probability tables that tell you exactly what your mana base needs.

Colored Source Requirements (60-Card Decks)

These are the key numbers from Karsten's research, targeting approximately 90% consistency (the probability that you'll have the right colors to cast your spell on curve):

Single Colored Pip (e.g., 1W, 2U, 3B)

• Cast on turn 1: 14 sources of that color
• Cast on turn 2: 13 sources
• Cast on turn 3: 12 sources
• Cast on turn 4: 10 sources
• Cast on turn 6: 9 sources

Double Colored Pip (e.g., WW, 1UU, 2BB)

• Cast on turn 2 (WW): 21 sources
• Cast on turn 3 (1WW): 18 sources
• Cast on turn 4 (2WW): 16 sources
• Cast on turn 5: 15 sources
• Cast on turn 6: 13 sources

Triple Colored Pip (e.g., WWW, 1UUU)

• Cast on turn 3 (WWW): 23 sources
• Cast on turn 4 (1WWW): 21 sources
• Cast on turn 5: 19 sources
• Cast on turn 6: 17 sources

What counts as a "source"? Any card that can reliably produce the required color of mana by the relevant turn. This includes basic lands, dual lands that produce the color, fetch lands that can find the color, and mana creatures/rocks that produce it (with caveats — see the ramp section below).

How to Read These Numbers

Suppose your deck plays Counterspell (UU, mana value 2). You want to cast it on turn 2. The table says you need 21 blue sources. That's a lot — nearly every land in your deck needs to produce blue. This is why UU costs are hard to support in multicolor decks, and why competitive decks rarely play double-pip cards outside their primary color.

Now suppose you play Wrath of God (2WW, mana value 4). You need it on turn 4, so you need 16 white sources. Much more manageable. This is why 4-mana double-pip cards are the sweet spot for splashed colors.

How Many Total Lands?

Total land count depends primarily on your mana curve — the distribution of mana values in your deck. Here are guidelines by average mana value:

60-Card Decks

• Avg MV < 2.0 (low-curve aggro): 20–22 lands
• Avg MV 2.0–2.5 (aggro/tempo): 22–24 lands
• Avg MV 2.5–3.0 (midrange): 24–25 lands
• Avg MV 3.0–3.5 (midrange/control): 25–26 lands
• Avg MV > 3.5 (control/ramp): 26–27 lands

Adjustments:

• Subtract 1 land for every 4 cantrips (e.g., Consider, Opt) in your deck
• Subtract 1 land if you have 4+ cheap card draw spells
• Add 1 land if you have expensive activated abilities or kicker costs
• Fetch lands do NOT meaningfully thin your deck enough to cut lands — the mathematical impact is less than 1% over a game

Karsten's Land Count Formula

For a more precise calculation, Karsten published a regression formula in his 2022 update that accounts for ramp, card draw, and modal double-faced cards (MDFCs).

60-card decks: Lands = 19.59 + (1.90 × avg MV) − (0.28 × cheap ramp + draw) − fast mana − (0.74 × untapped MDFCs) − (0.38 × tapped MDFCs)

100-card decks: Lands = 32.65 + (3.16 × avg MV) − (same adjustments scaled)

For example, a 60-card midrange deck with average MV 3.0, four cheap draw spells, and two untapped MDFCs: 19.59 + 5.70 − 1.12 − 1.48 = ~22.7, suggesting 23 lands. This formula is the basis for most competitive mana base calculators, including ours.

MDFCs as Fractional Lands

Modal double-faced cards with a land on the back face (like Shatterskull Smashing or Emeria's Call) count as partial lands. Based on Karsten's research:

• Untapped MDFC lands: Count as ~0.74 of a land
• Tapped MDFC lands: Count as ~0.38 of a land

So if you have 4 untapped MDFCs in your deck, that's roughly 3 extra lands worth of mana — letting you cut 2–3 actual land slots for more spells. This is why Zendikar Rising MDFCs were so powerful in Standard: decks could play 4+ "free" land slots disguised as spells.

Commander (99+1 Cards)

• Low-curve (avg MV < 2.5): 33–35 lands + 10–12 ramp sources
• Average curve (avg MV 2.5–3.5): 36–38 lands + 8–10 ramp sources
• High-curve (avg MV > 3.5): 38–40 lands + 10–12 ramp sources
• Landfall decks: 40–42 lands

The 99-card singleton format requires more lands than 60-card because you can't rely on drawing 4 copies of key cards to smooth your draws.

Limited (40-Card Decks)

• 17 lands is the default and correct for most decks
• 16 lands for very aggressive decks with a curve topping at 3–4 mana
• 18 lands for slow control decks or decks with many 5+ mana spells
• In a 2-color deck, a common split is 9/8 favoring your primary color

Colored Sources for Commander

Commander decks have 99 cards instead of 60, so Karsten's numbers need to be scaled up. The multiplier is approximately 1.65x (99/60). Here's what that means in practice:

• Single pip by turn 3: ~20 sources (12 × 1.65)
• Single pip by turn 4: ~17 sources (10 × 1.65)
• Double pip by turn 4: ~26 sources (16 × 1.65)

For a 2-color Commander deck, aim for 23–25 sources of each color. This is achievable with a mix of basics, dual lands, and mana rocks.

For a 3-color Commander deck, you need 20–22 sources per color. With only ~37 land slots, this means almost every land must produce 2+ colors. This is where fetch lands, shock lands, triomes, and utility fixers like Command Tower earn their keep.

For 4–5 color Commander decks, you need 18+ sources of every color. This is extremely demanding and requires premium fixing: all on-color fetches, shocks, triomes, bond lands, and rainbow lands like City of Brass, Mana Confluence, and The World Tree.

Commander Mana Base by Color Count

One of the most common questions in EDH: "How many lands do I need in Commander?" Here's the quick answer by color count, assuming an average mana curve (avg MV ~3.0):

• Mono-color: 36 lands. All basics plus 4–6 utility lands (Nykthos, War Room, Castle cycle). You need ~22 colored sources, which basics alone cover.
• 2-color: 36–37 lands. Run 8–12 dual lands (shock, check, pain, bond). Aim for 23–25 sources of each color. Add Command Tower and Exotic Orchard.
• 3-color: 36–38 lands. You need 20–22 sources per color. This requires 15–20 duals plus triomes, fetches, and rainbow lands. Almost no room for colorless utility lands.
• 4-color: 37–38 lands. 18+ sources per color. Run every on-color fetch, shock, and triome. Add City of Brass, Mana Confluence, The World Tree.
• 5-color: 37–39 lands. 16+ sources per color. Maximum fixing density. Green ramp that finds typed duals (Nature's Lore, Three Visits) is essential.

These are starting points. Your actual numbers depend on your mana curve, ramp count, and card draw. Use our Mana Base Calculator in Commander mode to get exact recommendations for your specific deck.

What Counts as a Colored Source?

Not all mana sources are equal. Here's how to count different land types:

• Basic land: 1 source of its color
• Untapped dual land (shock, check, fast, pain): 1 source of each color
• Tapped dual land (temple, gain land): ~0.9 sources of each color (the tapped entry means it's not available on curve part of the time)
• Fetch land: 1 source of every color its targets can produce. Flooded Strand is 1 white and 1 blue source; if your deck has Steam Vents, it's also 1 red source
• Command Tower / Exotic Orchard: 1 source of each color in your commander's identity
• Pathway land: ~0.5 sources of each color (you choose one when you play it, so it's only half a source for the color you don't choose)
• Utility land (e.g., Field of Ruin, Urza's Saga): 0 colored sources — they take a land slot without helping your color requirements

Counting Ramp Spells and Mana Rocks

Ramp spells and mana creatures produce mana, but they're not lands — they take a spell slot and cost mana to deploy. Here's how to factor them in:

• 1-mana dork (Llanowar Elves, Birds of Paradise): Count as ~0.5 colored sources. Available from turn 2 onward, but vulnerable to creature removal — this fragility is why they're weighted lower than artifacts
• 2-mana rock (Arcane Signet, Mind Stone): Count as ~0.75 colored sources. Harder to remove than creatures, so more reliable
• 2-mana land ramp (Rampant Growth, Farseek): Count as ~0.75 colored sources. They find an actual land that stays on the battlefield permanently — the most durable form of ramp
• 3-mana ramp (Cultivate, Kodama's Reach): Count as ~0.75 colored sources per land found, but too slow to help your early-game mana requirements
• Sol Ring, fast mana (Mana Crypt, Mox Diamond): Count as ~1.0 for total mana availability. Sol Ring doesn't produce colored mana, but the tempo advantage is so large it effectively replaces a land

For total land count, the Karsten formula weights each cheap ramp or draw spell (MV ≤ 2) at about −0.28 lands — meaning every 4 cheap ramp/draw spells lets you cut roughly 1 land. This is separate from the per-color source credit above.

Critical rule: You need enough actual lands to cast your ramp spells in the first place. Don't cut lands to add ramp — if you can't reliably hit your first 3 land drops, a hand full of 2-mana rocks is useless. A good Commander guideline: at minimum 33 lands even in the most ramp-heavy deck.

Land Count by Format

Standard

Standard decks typically run 24–26 lands. Without fetch lands, you rely on dual land cycles currently in print (pain lands, slow lands, verge lands, surveil lands as of early 2026). A 2-color Standard deck usually has 4–8 dual lands plus basics. Three-color decks need 12+ duals and accept some tapped lands (triomes, surveil lands) for fixing.

Pioneer

Pioneer runs 23–26 lands. The key difference from Modern: fetch lands are banned. This means shock lands are less dominant (you can't fetch them), and pain lands, check lands, and fast lands carry more weight. Three-color decks rely heavily on triomes and pathways for fixing.

Modern

Modern decks run 20–24 lands, slightly fewer than Standard because the card quality is higher (cheaper spells, more cantrips). The fetch + shock mana base is the gold standard — a typical 2-color deck runs 4–8 fetches, 1–2 shocks, and a mix of fast lands, horizon lands, and basics. Three-color decks add 1–2 triomes (fetchable three-color fixing) and run more fetches.

Legacy

Legacy decks run 18–22 lands thanks to extremely cheap spells and abundant cantrips (Brainstorm, Ponder). Fetch lands + original dual lands provide near-perfect fixing. Wasteland is a format staple, so many decks play extra basic lands to protect against it.

Commander

Commander decks run 35–38 lands plus 8–12 ramp sources. Start with Command Tower and Sol Ring (auto-includes in every deck). Then fill in dual lands based on your budget: bond lands (always untapped in multiplayer), shock lands, check lands, and pain lands form the core. See our Dual Land Cycles Guide for detailed recommendations by format and budget.

Building Multicolor Mana Bases

2-Color Decks

The easiest multicolor mana base. With 24 lands in a 60-card deck, you can achieve 14+ sources of each color with just 4–8 dual lands and the rest basics. Split your basics according to which color has more pips in your deck. If your deck is 60% white and 40% blue, run more Plains than Islands.

3-Color Decks

Significantly harder. You need 12+ sources of each color, and with only 24 land slots, almost every land needs to produce multiple colors. In Modern, this is solved by fetches + shocks + triomes. In Pioneer (no fetches), expect 3–4 tapped lands in your mana base and adjust your curve accordingly — don't play many 1-drops in a 3-color Pioneer deck.

4–5 Color Decks

Only viable in formats with premium fixing (Legacy, Modern) or in Commander. In 60-card formats, you need almost entirely nonbasic lands, which makes you vulnerable to Blood Moon and Back to Basics. In Commander, 5-color mana bases lean on rainbow lands (City of Brass, Mana Confluence, The World Tree), green ramp (Nature's Lore, Three Visits finding typed duals), and signets/talismans.

Common Mana Base Mistakes

1. Too Few Sources for Double-Pip Costs

The most common mistake. Players see they have "12 white sources" and assume that's enough for Wrath of God (2WW). But Karsten's math says you need 16 white sources to cast it on turn 4 with 90% consistency. Those 4 missing sources mean you'll be stuck with an uncastable Wrath in your hand roughly 1 in 5 games.

2. Too Many Tap Lands

Every tapped land effectively costs you one mana — you're a full turn behind. In competitive 60-card decks, 0–2 tapped lands is the standard. In Commander, you can afford more (games are longer), but even there, minimizing tapped lands improves your performance. A good rule: never play a tapped land that doesn't have an additional upside (scry, basic types for fetchability, cycling).

3. Ignoring Mana Curve When Choosing Land Count

A deck with an average mana value of 2.0 does not need 26 lands. Conversely, a deck with multiple 5+ mana spells cannot survive on 22 lands. Your land count should match your curve, not a generic "24 lands" rule.

4. Not Accounting for Utility Lands

Lands like Field of Ruin, Blast Zone, or Urza's Saga provide utility but don't produce colored mana. Every utility land you add reduces your colored sources. If your deck wants 14 blue sources and you add 2 colorless utility lands, you need to add 2 more blue-producing lands to compensate.

5. Cutting Lands for More Spells

It's tempting to think "one more removal spell is better than one more land." In reality, mana screw is the single most common reason for losing games of Magic. A deck that can consistently cast its spells beats a deck with one extra spell that stumbles on mana. Trust the math — play the lands Karsten's numbers tell you to.

6. Relying on Ramp Instead of Lands

Mana dorks die to removal. Mana rocks get destroyed by Vandalblast and Bane of Progress. Ramp spells require mana to cast. Lands are the most reliable mana source in the game. Use ramp to accelerate, not to replace lands.

Advanced Mana Base Concepts

Sliding Confidence Thresholds

Karsten's original research targets roughly 90% consistency for all spells. But missing a 1-drop on turn 1 is less punishing than missing a 6-drop on turn 6 (where you've invested an entire game waiting to cast it). Modern implementations — including our Mana Base Calculator — use a sliding scale: 90% for mana value 1 spells, gradually increasing to 95% for mana value 6+ spells.

Untapped vs. Total Sources

Not all sources are created equal. If you need to cast Thoughtseize on turn 1, you need 14 untapped black sources. A Temple of Silence (enters tapped) doesn't count toward that number — it produces black mana but not on turn 1. When evaluating early-game spells, count only lands that reliably enter untapped.

Per-Color Tempo Analysis

In a multicolor deck, different colors may be needed at different points in the game. If your white cards are mostly 1–2 drops and your black cards are 3–5 drops, you need more untapped white sources (for tempo) but can afford tapped black sources (where the tapped turn is less costly). Advanced mana base builders — like our calculator — analyze each color's tempo needs independently.

Conditional Lands and Context

Some lands are only good in specific decks. Cavern of Souls is a premium source in tribal decks but useless in spellslinger builds. Plaza of Heroes is excellent in legendary-heavy decks. When evaluating conditional lands, ask: "In my specific deck, how often is this land's condition met?" If the answer is "always" or "almost always," treat it as a full source.

Calculate Your Mana Base Now

Everything in this guide is built into our free MTG Mana Base Calculator. It runs Frank Karsten's hypergeometric math for you — just pick your format and colors, or import your decklist for instant analysis:

• Try it: 3-color Commander deck — see how 37 lands splits across Esper colors
• Try it: Standard Boros Aggro — land count and dual land picks for an aggro build
• Try it: Modern Temur Midrange — fetch + shock recommendations for 3-color

The calculator recommends specific dual land cycles by tier, tracks untapped sources for tempo-critical spells, runs WASM-powered Monte Carlo simulations, and handles ramp, MDFCs, and conditional lands like Cavern of Souls. It supports every format: Standard, Pioneer, Modern, Legacy, Pauper, Commander, and Limited.

More Resources

For detailed guidance on which dual lands to play in your format, read our Complete Dual Land Cycles Guide — every cycle ranked by tier with format legality and strategy advice.

Building a Commander deck from scratch? Our Commander Deck Building Guide covers the 10-10-10 framework, power brackets, and EDH-specific mana base advice.

Check draw probabilities for any card in your deck with our Hypergeometric Calculator.

Already drafted your pool? Build the optimal mana base for Limited with the Mana Base Calculator in Limited mode, or practice drafting with our Draft Simulator and open packs in the Sealed Pool Simulator.