These five calculators cover the questions an experienced MTG player asks between games: is my curve safe? should I keep this opener? am I actually building a 99 or a 112? Every tool runs in your browser, so paste a deck list freely — it never leaves your device.
Paste a deck list (one card per line, e.g. 4 Lightning Bolt) and the tool computes your converted mana cost distribution, gives a real visual histogram, and assigns a curve-quality score from 0–100. Unlike generic histogram tools, we factor in average mana value, drop-off between adjacent slots, and the "spike" risk if your top end is too heavy.
A common rookie question: "do I really need 60 cards in Standard?" — yes, but why? This solver takes your core playset counts and the expected number of games, then computes the smallest deck size where the probability of drawing one of your key cards by turn N still clears a target threshold. The answer is usually 60, but for singleton formats it can be lower.
We don't just shuffle 7 random cards. This tool draws N virtual opening hands from your deck, applies the current mulligan rule you select (Vancouver, London, Paris), and rates each hand with the actual keep / mulligan verdict you'd give at the table: lands, color-sources for spells, and curve fit. There's no auto-pilot — you see the proposed decision and decide.
Run 1,000+ hands in seconds and look at the distribution of "keepable" percentages across the deck — a much better deck-health indicator than a single sample hand.
Counts mana pips (W/U/B/R/G) and on-color sources (lands that can produce them). Flags decks where the dominant color lacks enough sources (≥ 8 sources for an off-color splash is a common failure mode), and warns when a splash is so deep that you really need 4 fetch lands, not 2.
Four players, twenty-one commander hits each, poison, commander tax, emblems, one-tap undo. Built for phones so the player across the table can read it. No logins, no auto-rollback. State lives in your browser; we never see it.
A deck of 20 two-drops and 40 lands drops everything on curve but can't close games. The score penalizes flatness at CMC 2 because real games need a top end. The exception: hyper-aggro decks in Modern/Legacy can safely ignore this.
Use London for competitive and most casual play (post-2019). Paris is only relevant for very casual tables. The simulator implements both because the answer can change by 4–6 percentage points for low-color decks.
CMC is a static number; we parse it from your input. Pulling Scryfall for every card would slow the tool and send your deck to a third party — defeating the privacy promise.
Auto-detection would need camera + card-recognition, which is a privacy and battery hazard. Clicking is faster than that and works offline.