Niv-Mizzet, Guildpact (Serialized) [Murders at Karlov Manor] Troll Warlock you may have that player

you may have that player gain control of Slicer until end of turn

up to one hundred target creatures each get +0/+X until end of turn

you put a +1/+1 counter on Firkraag

When a spell or ability an opponent controls causes you to discard Guerrilla Tactics

Sacrifice another creature: Search your library for a creature card with mana value X or less

Niv-Mizzet, Guildpact (Serialized) [Murders at Karlov Manor] Troll Warlock you may have that playerSet: Murders at Karlov Manor Type: Legendary Creature Dragon Avatar Rarity: Rare Cost: {W}{U}{B}{R}{G} Flying, hexproof from multicolored Whenever Niv Mizzet, Guildpact deals combat damage to a player, it deals X damage to any target, target plater 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.