Niv-Mizzet, Guildpact
From Murders at Karlov Manor set
Niv-Mizzet, Guildpact
Legendary Creature — Dragon Avatar
6/6
Flying, hexproof from multicolored
Whenever Niv-Mizzet deals combat damage to a player, it deals X damage to any target, target player draws X cards, and you gain X life, where X is the number of different color pairs among permanents you control that are exactly two colors.