Siren's Call [Beta Edition] Amonkhet Invocations Set: Kaladesh Inventions Type: Artifact

Set: Kaladesh Inventions Type: Artifact Creature — Thopter Rarity: Mythic Cost: {0} Flying

Set: Arabian Nights Type: Creature — Djinn Rarity: Rare Cost: {2}{U}{U} Flying

Set: Portal Three Kingdoms Type: Sorcery Rarity: Uncommon Cost: {1}{R} Rockslide Ambush deals damage to target creature equal to the number of Mountains you control

" —The Underworld Cookbook

Siren's Call [Beta Edition] Amonkhet Invocations Set: Kaladesh Inventions Type: ArtifactSet: Beta Edition Type: Instant Rarity: Uncommon Cost: {U} Cast this spell only during an opponent's turn, before attackers are declared. Creatures the active player controls attack this turn if able. At the beginning of the next end step, destroy all non Wall creatures that player controls that didn't attack this turn. Ignore this effect for each creature the player didn't control continuously since the beginning of the turn.