What is the London mulligan in Commander?

The London mulligan lets you put any number of cards from your hand on the bottom of your library, then draw back up to seven. In Commander, your first mulligan is free.

How many iterations does the simulator run?

Free users get 2,000 simulations; Pro users can run up to 20,000 for more stable results.

What counts as a 'success' card?

You define success cards as anything you need in your opener — lands, ramp, tutors, or combo pieces.

Does the calculator support play vs draw?

Yes. Toggle play/draw to model being on the draw (you draw one extra card before the game starts).

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Mulligan Simulator

Test your deck's consistency with real opening hand simulations. See keep rates for 7/6/5 card hands using London mulligan rules. Customize land requirements, key cards, and mana ratios to optimize your deck's performance.

London Mulligan

Keep Rate Analysis

10,000 Simulations

Deck Input

Paste your decklist below, or use the example deck.

1 The Ur-Dragon

// Ramp (12)
1 Sol Ring
1 Arcane Signet
1 Commander's Sphere
1 Chromatic Lantern
1 Kodama's Reach
1 Cultivate
1 Rampant Growth
1 Nature's Lore
1 Three Visits
1 Farseek
1 Skyshroud Claim
1 Explosive Vegetation

// Dragons (30)
1 Dragonlord Ojutai
1 Dragonlord Silumgar
1 Dragonlord Atarka
1 Dragonlord Dromoka
1 Dragonlord Kolaghan
1 Bladewing the Risen
1 Nicol Bolas
1 Palladia-Mors
1 Vaevictis Asmadi
1 Chromium
1 Arcades Sabboth
1 Steel Hellkite
1 Utvara Hellkite
1 Scourge of Valkas
1 Karrthus, Tyrant of Jund
1 Lathliss, Dragon Queen
1 Scion of the Ur-Dragon
1 Dragonmaster Outcast
1 Thunderbreak Regent
1 Stormbreath Dragon
1 Glorybringer
1 Niv-Mizzet, Parun
1 Niv-Mizzet, Dracogenius
1 Atarka, World Render
1 Dromoka, the Eternal
1 Kolaghan, the Storm's Fury
1 Ojutai, Soul of Winter
1 Silumgar, the Drifting Death
1 Dragon Broodmother
1 Savage Ventmaw

// Support (20)
1 Sarkhan, Fireblood
1 Sarkhan Vol
1 Crucible of Fire
1 Dragon Tempest
1 Rhythm of the Wild
1 Temur Ascendancy
1 Kindred Discovery
1 Descendants' Path
1 Elemental Bond
1 Return of the Wildspeaker
1 Rishkar's Expertise
1 Heroic Intervention
1 Teferi's Protection
1 Cyclonic Rift
1 Beast Within
1 Chaos Warp
1 Dragonlord's Servant
1 Dragonspeaker Shaman
1 Urza's Incubator
1 Herald's Horn

// Lands (37)
1 Command Tower
1 Path of Ancestry
1 Exotic Orchard
1 Reflecting Pool
1 Mana Confluence
1 City of Brass
1 Forbidden Orchard
1 Sandsteppe Citadel
1 Opulent Palace
1 Nomad Outpost
1 Mystic Monastery
1 Frontier Bivouac
1 Savage Lands
1 Crumbling Necropolis
1 Jungle Shrine
1 Arcane Sanctum
1 Seaside Citadel
1 Evolving Wilds
1 Terramorphic Expanse
1 Command Beacon
3 Forest
3 Mountain
2 Plains
2 Island
2 Swamp
1 Rootbound Crag
1 Sunpetal Grove
1 Dragonskull Summit
1 Drowned Catacomb
1 Glacial Fortress
1 Hinterland Harbor

Import from My Decks

Pick a deck to auto-fill N. Add a match term or select cards to set K.

Deck size

Desired cards in deck

Lands in deck

Keep if at least (k)

Iterations

Min lands Max lands Free 7 (Commander) On the draw

Commander Mulligan Simulator

Simulate thousands of opening hands to see how often you'll keep or mulligan with Commander rules. The London mulligan lets you draw back up to seven after putting cards on the bottom — and in Commander, your first mulligan is free.

How it works

Set your deck size (typically 100 for Commander), how many "success" cards you need (e.g. lands, ramp, or combo pieces), and your land count. The simulator runs thousands of iterations to estimate keep rates for 7, 6, and 5 cards.

Use with your deck

Load a deck from your ManaTap account to auto-fill land count and success cards. Or paste a decklist to analyze any build before you sleeve it up.

FAQ

What is the London mulligan in Commander?: The London mulligan lets you put any number of cards from your hand on the bottom of your library, then draw back up to seven. In Commander, your first mulligan is free.
How many iterations does the simulator run?: Free users get 2,000 simulations; Pro users can run up to 20,000 for more stable results.
What counts as a 'success' card?: You define success cards as anything you need in your opener — lands, ramp, tutors, or combo pieces.
Does the calculator support play vs draw?: Yes. Toggle play/draw to model being on the draw (you draw one extra card before the game starts).

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