name: Siren's Call
originalText: All of opponent's creatures that can attack must do so. Any non-wall creatures that cannot attack are destroyed at end of turn. Play only during opponent's turn, before opponent's attack. Creatures summoned this turn are unaffected by Siren's Call.
printings: 2ED, 30A, 3ED, 4BB, 4ED, CED, CEI, FBB, LEA, LEB, SUM
text: 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.
type: Instant