When Accursed Centaur enters the battlefield, sacrifice a creature.
Sacrifice a creature: Target player puts a number of cards equal to the sacrificed creature's power from the top of his or her library into his or her graveyard.
As an additional cost to cast Altar's Reap, sacrifice a creature.
Draw two cards.
Sacrifice a creature: Add to your mana pool.
, Sacrifice a creature: Destroy target nonblack creature.
Trample
Black Carriage doesn't untap during your untap step.
Sacrifice a creature: Untap Black Carriage. Activate this ability only during your upkeep.
, Sacrifice a creature: Blasting Station deals 1 damage to target creature or player.
Whenever a creature enters the battlefield, you may untap Blasting Station.
, Sacrifice a Swamp: Target creature gets +1/+1 until end of turn.
, Sacrifice a creature: Target creature gets +2/+2 until end of turn.
Noncreature spells you cast cost less to cast.
Whenever you cast a noncreature spell, counter that spell unless you sacrifice a creature.
, Sacrifice a creature: Blood Rites deals 2 damage to target creature or player.
Sacrifice a creature: Put a +1/+1 counter on Bloodflow Connoisseur.
, Sacrifice a creature: Bloodshot Cyclops deals damage equal to the sacrificed creature's power to target creature or player.
Sacrifice a creature: Bloodthrone Vampire gets +2/+2 until end of turn.
As an additional cost to cast Bone Splinters, sacrifice a creature.
Destroy target creature.
When you cast Brain Gorgers, any player may sacrifice a creature. If a player does, counter Brain Gorgers.
Madness (If you discard this card, you may cast it for its madness cost instead of putting it into your graveyard.)
, Sacrifice a creature: Counter target creature spell.
As an additional cost to cast Burnt Offering, sacrifice a creature.
Add X mana in any combination of and/or to your mana pool, where X is the sacrificed creature's converted mana cost.
, Sacrifice a creature: Target creature gets -2/-2 until end of turn.
, Exile a creature card from your graveyard: Target creature gets -2/-2 until end of turn.
Name a nonland card. Target player reveals his or her hand and discards all cards with that name.
Flashback—Sacrifice a creature. (You may cast this card from your graveyard for its flashback cost. Then exile it.)
As an additional cost to cast Call for Blood, sacrifice a creature.
Target creature gets -X/-X until end of turn, where X is the sacrificed creature's power.
, Sacrifice a creature: Draw a card.
As an additional cost to cast Carrion, sacrifice a creature.
Put X 0/1 black Insect creature tokens onto the battlefield, where X is the sacrificed creature's power.
Carrion Feeder can't block.
Sacrifice a creature: Put a +1/+1 counter on Carrion Feeder.
Sacrifice a creature: Regenerate Cateran Overlord.
, : Search your library for a Mercenary permanent card with converted mana cost 6 or less and put it onto the battlefield. Then shuffle your library.
Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)
When Commander Greven il-Vec enters the battlefield, sacrifice a creature.
(If you discard this card, you may cast it for its madness cost instead of putting it into your graveyard.)