Running the simulation…

 

What to change

Suggestions appear when the games finish.

At a glance

Opening hands

Lands in the kept hand

Think you know a keep? with this deck.

About FreeMully

What is goldfishing?

Goldfishing means playing a deck against an empty table, with no one interacting, to see how it runs on its own. It's the quickest way to learn whether your mana works: how often you make your land drops, when your commander comes down, and which spells get stuck in hand.

What does FreeMully measure?

It shuffles your Commander deck and plays it 10,000 times: London mulligans with a free first one, a draw on turn one, one land a turn, and colored mana checked pip by pip. You see how often your commander lands on curve, how often you're mana screwed or flooded, which spells you can't cast on time, and which changes would help.

How many lands should a Commander deck run?

Many decks run 35 to 38. Frank Karsten's formula estimates it from your curve: 31.42 + 3.13 × average mana value − 0.28 × cheap ramp and card draw. FreeMully works out that number for your deck, and its land-count sweep plays your deck at 33 to 39 lands so you can see the trade-off between missed land drops and flooding. Read the full land-count guide.

Which decklists work?

Paste a Moxfield or Archidekt deck link (public or unlisted), or the list itself: from any other site, use Export and copy the text. Plain lists like “1 Sol Ring” work too. Card names are matched against Scryfall's data, including double-faced, split and adventure cards, which can be listed by either half.

Is it free? Where do my decks go?

It's free, with no account. Everything runs in your browser, and your decks are saved only in that browser. A pasted list never leaves your device. If you paste a Moxfield or Archidekt link, FreeMully's server fetches that public deck for you and passes it straight back; it keeps a copy for up to ten minutes so reloading is quick, and stores nothing else.

How is this different from a hypergeometric calculator?

A hypergeometric calculator, or a Monte Carlo version of one, tells you how likely you are to draw something by a given turn. FreeMully plays each game: it mulligans, chooses which land to play, casts ramp, checks every colored pip against the lands and rocks you actually have, and tracks tapped lands, Treasures, cost reducers, tutors and card draw. So instead of “you'll have four lands by turn four,” you learn how often your commander actually comes down on curve, and which spells get stuck because you're short on a color.

Does FreeMully use AI?

Not when it runs. The simulator is ordinary code that runs entirely in your browser: it shuffles, draws, mulligans by a set rule, then plays each turn by fixed priorities, 10,000 times over. Nothing is sent to an AI service, a pasted decklist never leaves your device, and it works offline. I built it with Claude, an AI model, as a coding partner: Claude wrote much of the code, including the card rules and the tests. I decide how the goldfish should play, and I check the results against real decks and the reports players send in.

What doesn't it model?

Opponents, removal, combat, tokens and commander tax. The numbers describe how your mana and curve perform, not how the deck wins. for the full details.