Siren's Call [Beta Edition] Commander 2015 gain control of target permanent

gain control of target permanent that player controls

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Whenever a creature an opponent controls with a -1/-1 counter on it dies

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Siren's Call [Beta Edition] Commander 2015 gain control of target permanentSet: Beta 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.