Wall of Bone [Alpha Edition] Time Spiral Promos They have "Sacrifice this creature:

They have "Sacrifice this creature: Add {C}

Tap that creature as it phases in this way

Flip a coin until you get tails

Set: Shadows over Innistrad Type: Enchantment Rarity: Rare Cost: {1}{G} Creatures you control have "{T}: Add one mana of any color

Set: Ixalan Prerelease Promos Type: Creature — Vampire Knight Rarity: Rare Cost: {2}{B}{B} Whenever a Vampire you control attacks

Wall of Bone [Alpha Edition] Time Spiral Promos They have "Sacrifice this creature:Set: Alpha Edition Type: Creature Skeleton Wall Rarity: Uncommon Cost: {2}{B} Defender (This creature can't attack.) {B}: Regenerate Wall of Bone. (The next time this creature would be destroyed this turn, it isn't. Instead tap it, remove all damage from it, and remove it from combat.) The Wall of Bone is said to be an aspect of the Great Wall in Hel, where the bones of all sinners wait for Ragnarok, when Hela will call them forth for the final battle.