What it does
Converge counts the number of different colors of mana you spent to cast a spell, and that spell's effect scales based on that count. A spell with converge gets stronger the more colors you pump into it—so paying with white, blue, and black mana gives it a converge value of 3.
The key nuance: it counts colors of mana spent, not the colors in the spell's cost or the number of mana spent. Spending two black mana still only counts as one color. Colorless mana doesn't add to the count at all, since colorless isn't a color. Effects that reduce or alter how you pay can lower your converge if you skip colored mana.
In Commander, converge rewards heavily multicolored decks—four- and five-color builds maximize cards like Painful Truths or Radiant Flames. It's weak in two-color decks, so build around it intentionally.
Iconic cards with Converge
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