Niv-Mizzet, Guildpact is a rare Legendary Creature — Dragon Avatar card from Magic: The Gathering (Murders at Karlov Manor, MKM). Current market price: $0.37.
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.
