All of opponent's creatures that can attack must do so. Any non-wall creatures that cannot attack are killed at end of turn. Can be played only during opponent's turn, before opponent's attack. Creatures summoned this turn are unaffected by Siren's Call.

• Number: 236
• Rarity: U
• Type: Instant
• Mana cost: U
• Color: Blue
• Artist: Anson Maddocks