Innocent Traveler

At the beginning of your upkeep, any opponent may sacrifice a creature of their choice. If no one does, transform this creature.

Malicious Invader

Flying
This creature gets +2/+0 as long as an opponent controls a Human.

Innocent Traveler // Malicious Invader

Mindleech Ghoul

Exploit (When this creature enters, you may sacrifice a creature.)
When this creature exploits a creature, each opponent exiles a card from their hand.

Thraben Exorcism

Exile target Spirit, creature with disturb, or enchantment.

Parasitic Grasp

Cleave {1}{B}{B} (You may cast this spell for its cleave cost. If you do, remove the words in square brackets.)
Parasitic Grasp deals 3 damage to target [Human] creature. You gain 3 life.

Path of Peril

Cleave {4}{W}{B} (You may cast this spell for its cleave cost. If you do, remove the words in square brackets.)
Destroy all creatures [with mana value 2 or less].

Persistent Specimen

{2}{B}: Return this card from your graveyard to the battlefield tapped.

Blood

Pointed Discussion

You draw two cards, lose 2 life, then create a Blood token. (It's an artifact with "{1}, {T}, Discard a card, Sacrifice this token: Draw a card.")

"Forgive my manners. It's been so long since I had a guest for dinner."

Ragged Recluse

At the beginning of your end step, if you discarded a card this turn, transform this creature.

Her cauldron refilled, she settled in to wait for the next unsuspecting traveler to knock at her door.

Odious Witch

Whenever this creature attacks, defending player loses 1 life and you gain 1 life.

Ragged Recluse // Odious Witch

Restless Bloodseeker // Bloodsoaked Reveler

Restless Bloodseeker

At the beginning of your end step, if you gained life this turn, create a Blood token. (It's an artifact with "{1}, {T}, Discard a card, Sacrifice this token: Draw a card.")
Sacrifice two Blood tokens: Transform this creature. Activate only as a sorcery.

Bloodsoaked Reveler

At the beginning of your end step, if you gained life this turn, create a Blood token. (It's an artifact with "{1}, {T}, Discard a card, Sacrifice this token: Draw a card.")
{4}{B}: Each opponent loses 2 life and you gain 2 life.

Rot-Tide Gargantua

Exploit (When this creature enters, you may sacrifice a creature.)
When this creature exploits a creature, each opponent sacrifices a creature of their choice.

Skulking Killer

When this creature enters, target creature an opponent controls gets -2/-2 until end of turn if that opponent controls no other creatures.

Vampire

Sorin the Mirthless

+1: Look at the top card of your library. You may reveal that card and put it into your hand. If you do, you lose life equal to its mana value.
−2: Create a 2/3 black Vampire creature token with flying and lifelink.
−7: Sorin deals 13 damage to any target. You gain 13 life.

Toxrill, the Corrosive

Slug

At the beginning of each end step, put a slime counter on each creature you don't control.
Creatures you don't control get -1/-1 for each slime counter on them.
Whenever a creature you don't control with a slime counter on it dies, create a 1/1 black Slug creature token.
{U}{B}, Sacrifice a Slug: Draw a card.

"With Avacyn gone, I no longer knew who to pray to. Alone, I wept for a sister who would never return."

Bereaved Survivor

When another creature you control dies, transform this creature.

"It was Sigarda who lifted me from despair and gave me the strength to fight on."

Dauntless Avenger

Whenever this creature attacks, return target creature card with mana value 2 or less from your graveyard to the battlefield tapped and attacking.

Bereaved Survivor // Dauntless Avenger

Unruly Mob

Whenever another creature you control dies, put a +1/+1 counter on this creature.

Undead Butler

When this creature enters, mill three cards. (Put the top three cards of your library into your graveyard.)
When this creature dies, you may exile it. When you do, return target creature card from your graveyard to your hand.

Innistrad: Double Feature