How the mulligan simulator works
Magic games are won and lost on the opening hand. This free mulligan simulator shuffles your real decklist and deals you a seven-card hand so you can practice the keep-or-mulligan decision before you sit down to play. It uses the London mulligan rules used in modern Magic: each time you mulligan you draw a fresh seven, then put a number of cards equal to how many times you've mulliganed on the bottom of your library. Paste a Commander / EDH or 60-card decklist and draw as many hands as you like.
Reading your opening hand
For each hand we look up every card on Scryfall, so we can tell you exactly how many lands and nonland spells you drew and the hand's average mana value — the numbers that decide whether a hand is keepable. A common rule of thumb is that a seven-card hand wants two to five lands; too few and you can't cast your spells, too many and you flood out. The simulator marks which cards it would put on the bottom for a London mulligan so you can see the realistic kept hand.
How the probability calculator works
The probability calculator uses the hypergeometric distribution — the correct math for drawing without replacement, which is exactly what happens when you draw cards from a shuffled deck. You tell it four things: your deck size (N), how many copies of the thing you care about are in the deck (K, e.g. 38 lands), how many cards you're drawing (n, usually 7 for an opening hand), and the minimum you want (k). It returns the probability of drawing at least that many.
Why opening-hand odds matter
Knowing your numbers takes the guesswork out of deckbuilding. If you want to reliably hit your land drops, the calculator tells you whether 36, 38, or 40 lands gets you there. It works for any group of cards: the odds of opening a specific combo piece, an early-game answer, or your commander's key enabler. Pair it with our deck analyzer to check your ratios and the AI deck builder to build a more consistent list.
The calculator is exact, not an estimate — it computes the full hypergeometric probability directly. Want a more consistent deck? The KrakenTheMeta AI builder tunes your mana base and curve so your opening hands behave.