Siren's Call [Alpha Edition] Vanguard Set: From the Vault: Exiled

Set: From the Vault: Exiled Type: Sorcery Rarity: Mythic Cost: {2}{U} As an additional cost to cast this spell

Whenever a Dragon you control becomes the target of a spell or ability an opponent controls

Set: Urza's Saga Type: Enchantment Rarity: Rare Cost: {1}{B}{B} Whenever a player casts a spell

Set: HeartGold & SoulSilver: Undaunted Type: Lightning Rarity: Rare Retreat cost: Colorless

Siren's Call [Alpha Edition] Vanguard Set: From the Vault: ExiledSet: 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.