Siren's Call [Alpha Edition] 007 (Additional mana in the cost

(Additional mana in the cost may be paid with any color of mana or colorless mana

This ability can't cause the total number of +1/+0 counters on Clockwork Avian to be greater than four

their bones now rest

Set: Black & White: Dragons Exalted Type: Fighting Rarity: Ultra Rare Retreat cost: Colorless

Siren's Call [Alpha Edition] 007 (Additional mana in the costSet: 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.