As an additional cost to cast this spell, you may sacrifice any number of Spirits. Target creature gets +3/+0 until end of turn. For each Spirit sacrificed this way, that creature gets an additional +3/+0 until end of turn.
When Diabolic Servitude enters, return target creature card from your graveyard to the battlefield. When the creature put onto the battlefield with Diabolic Servitude dies, exile it and return Diabolic Servitude to its owner's hand. When Diabolic Servitude leaves the battlefield, exile the creature put onto the battlefield with Diabolic Servitude.
{B}, Discard a card: Regenerate Dirty Wererat. Threshold — As long as seven or more cards are in your graveyard, Dirty Wererat gets +2/+2 and can't block.
Creatures you control get +1/+0. [+1]: Add {R} or {G}. Creature spells you cast this turn can't be countered. [–2]: Target creature you control fights target creature you don't control.
Flying When Doomsday Specter enters, return a blue or black creature you control to its owner's hand. Whenever Doomsday Specter deals combat damage to a player, look at that player's hand and choose a card from it. The player discards that card.
Artifact, instant, and sorcery spells your opponents cast cost {1} more to cast. [–1]: Until your next turn, prevent all damage that would be dealt to and dealt by target permanent an opponent controls.