Thermopod

{S}: This creature gains haste until end of turn. ({S} can be paid with one mana from a snow source.)
Sacrifice a creature: Add {R}.

Viscera Seer

Sacrifice a creature: Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Phyrexian Plaguelord

{T}, Sacrifice this creature: Target creature gets -4/-4 until end of turn.
Sacrifice a creature: Target creature gets -1/-1 until end of turn.

Scarland Thrinax

Sacrifice a creature: Put a +1/+1 counter on this creature.

Defiant Salvager

Sacrifice an artifact or creature: Put a +1/+1 counter on this creature. Activate only as a sorcery.

Cartel Aristocrat

Sacrifice another creature: This creature gains protection from the color of your choice until end of turn.

Bloodthrone Vampire

Sacrifice a creature: This creature gets +2/+2 until end of turn.

Dimir House Guard

Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)
Sacrifice a creature: Regenerate this creature.
Transmute {1}{B}{B} ({1}{B}{B}, Discard this card: Search your library for a card with the same mana value as this card, reveal it, put it into your hand, then shuffle. Transmute only as a sorcery.)

Vampire Aristocrat

Nantuko Husk

Yahenni, Undying Partisan

Haste
Whenever a creature an opponent controls dies, put a +1/+1 counter on Yahenni.
Sacrifice another creature: Yahenni gains indestructible until end of turn.

Carrion Feeder

This creature can't block.
Sacrifice a creature: Put a +1/+1 counter on this creature.

Sadistic Hypnotist

Sacrifice a creature: Target player discards two cards. Activate only as a sorcery.

Bloodflow Connoisseur

Butcher of the Horde

Flying
Sacrifice another creature: This creature gains your choice of vigilance, lifelink, or haste until end of turn.

Shilgengar, Sire of Famine

Flying
Sacrifice another creature: Create a Blood token. If you sacrificed an Angel this way, create a number of Blood tokens equal to its toughness instead.
{W/B}{W/B}{W/B}, Sacrifice six Blood tokens: Return each creature card from your graveyard to the battlefield with a finality counter on it. Those creatures are Vampires in addition to their other types.

Vampire Warlord

Sacrifice another creature: Regenerate this creature. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

Maw of the Obzedat

Sacrifice a creature: Creatures you control get +1/+1 until end of turn.

Varolz, the Scar-Striped

Each creature card in your graveyard has scavenge. The scavenge cost is equal to its mana cost. (Exile a creature card from your graveyard and pay its mana cost: Put a number of +1/+1 counters equal to that card's power on target creature. Scavenge only as a sorcery.)
Sacrifice another creature: Regenerate Varolz.

Falkenrath Torturer

Sacrifice a creature: This creature gains flying until end of turn. If the sacrificed creature was a Human, put a +1/+1 counter on this creature.

Bogardan Dragonheart

Sacrifice another creature: Until end of turn, this creature becomes a Dragon with base power and toughness 4/4, flying, and haste.

Immersturm Predator

Flying
Whenever this creature becomes tapped, exile up to one target card from a graveyard and put a +1/+1 counter on this creature.
Sacrifice another creature: This creature gains indestructible until end of turn. Tap it.

Blood Bairn

Sacrifice another creature: This creature gets +2/+2 until end of turn.

Fallen Angel

Flying
Sacrifice a creature: This creature gets +2/+1 until end of turn.

Dross Hopper

Sacrifice a creature: This creature gains flying until end of turn.

Corpse Blockade

Defender
Sacrifice another creature: This creature gains deathtouch until end of turn.

Flesh-Eater Imp

Flying
Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)
Sacrifice a creature: This creature gets +1/+1 until end of turn.

Nim Shambler

This creature gets +1/+0 for each artifact you control.
Sacrifice a creature: Regenerate this creature.

Woe Strider

When this creature enters, create a 0/1 white Goat creature token.
Sacrifice another creature: Scry 1.
Escape—{3}{B}{B}, Exile four other cards from your graveyard. (You may cast this card from your graveyard for its escape cost.)
This creature escapes with two +1/+1 counters on it.

Phyrexian Ghoul

Falkenrath Aristocrat

Flying, haste
Sacrifice a creature: This creature gains indestructible until end of turn. If the sacrificed creature was a Human, put a +1/+1 counter on this creature.