Vicious Offering [Dominaria] Elemental Bird Revenant's power and toughness are

Revenant's power and toughness are each equal to the number of creature cards in your graveyard

Set: Guilds of Ravnica Prerelease Promos Type: Legendary Creature — Elf Cleric Rarity: Rare Cost: {G}{W} Whenever Emmara

As Stuffy Doll enters the battlefield

Set: Kaladesh Prerelease Promos Type: Creature — Angel Rarity: Mythic Cost: {3}{W}{W} Flying

Vicious Offering [Dominaria] Elemental Bird Revenant's power and toughness areSet: Dominaria Type: Instant Rarity: Common Cost: {1}{B} KickerSacrifice a creature. (You may sacrifice a creature in addition to any other costs as you cast this spell.) Target creature gets 2 2 until end of turn. If this spell was kicked, that creature gets 5 5 until end of turn instead.