Sacrifice [Collectors' Edition] Explorers of Ixalan Set: Legends Type: Creature —

Set: Legends Type: Creature — Elemental Rarity: Rare Cost: {2}{U} When Time Elemental attacks or blocks

When Dance of the Dead enters the battlefield

Set: Beta Edition Type: Creature — Elemental Rarity: Uncommon Cost: {3}{R}{R} Fire Elementals are ruthless infernos

Set: International Collectors' Edition Type: Instant Rarity: Uncommon Cost: {G} Cast this spell only before the combat damage step

but I didn't expect it from the building itself

Sacrifice [Collectors' Edition] Explorers of Ixalan Set: Legends Type: Creature —Set: Collectors' Edition Type: Instant Rarity: Uncommon Cost: {B} As an additional cost to cast this spell, sacrifice a creature. Add an amount of {B} equal to the sacrificed creature's mana value.