Ravenous Vampire [Mirage]

Ravenous Vampire [Mirage]Set: Mirage Type: Creature Vampire Rarity: Uncommon Cost: {3}{B}{B} Flying At the beginning of your upkeep, you may sacrifice a nonartifact creature. If you do, put a +1 +1 counter on Ravenous Vampire. If you don't, tap Ravenous Vampire. Eternal life brings eternal hunger.

it doesn't take much brains to slaughter and maim

Set: Fourth Edition Type: Artifact Creature — Bird Rarity: Rare Cost: {5} Flying

Set: Planechase Type: Artifact Creature — Myr Rarity: Common Cost: {2} {T}: Add {G}

Set: Ravnica: City of Guilds Type: Enchantment — Aura Rarity: Common Cost: {2}{B}{B} Enchant creature

Set: Urza's Legacy Type: Instant Rarity: Common Cost: {1}{U} Counter target spell unless its controller pays {2}

as can their creator

where X is the number of artifacts you control

Set: Future Sight Type: Creature — Ogre Rarity: Common Cost: {3}{R} Haste

Set: Battle for Zendikar Type: Basic Land — Island Rarity: Common ({T}: Add {U}

or three target creatures

−7: Create three 1/1 black Assassin creature tokens with "Whenever this creature deals combat damage to a player

Whenever you cast a blue creature spell