Powerwolf

Werewolves you cast cost {1} less for each cleric you control. Whenever a creature dies its owner creates a blood token. (It’s an artifact with “{1}, {T}, Discard a card, Sacrifice this token: Draw a card.”) Whenever you sacrifice an artifact you may shuffle a card from your graveyard into your deck. Whenever an opponent sacrifices a blood token, you gain life equal to Powerwolf’s power. Whenever you attack, as long as that defending player has 4 or more blood tokens, werewolves you control have menace.