Siren's Call [Alpha Edition] XY171 Set: EX: Hidden Legends Type:

Set: EX: Hidden Legends Type: Metal Rarity: Ultra Rare Retreat cost: Colorless

Set: Dungeons & Dragons: Adventures in the Forgotten Realms Promos Type: Legendary Creature — Dragon Rarity: Mythic Cost: {3}{U}{U} Flying

Set: Commander Legends Type: Legendary Creature — Human Cleric Rarity: Mythic Cost: {1}{W}{B} Lifelink

They move in a synchronized swarm

Siren's Call [Alpha Edition] XY171 Set: EX: Hidden Legends Type:Set: Alpha 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.