Siren's Call [Limited Edition Beta] Instant (Mana abilities can't be targeted

(Mana abilities can't be targeted

Untap all creatures you control

where X is that creature's power

among any of the creatures it's being blocked by or is blocking

Siren's Call [Limited Edition Beta] Instant (Mana abilities can't be targetedSet: Limited Edition Beta Type: Instant 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.