Siren's Call [Beta Edition] Commander 2016 You draw cards equal to

You draw cards equal to the sacrificed creature's power

Nature grows solutions to her problems

then draws seven cards

Whenever a land enters the battlefield under an opponent's control

where X is the number of Swamps you control

Siren's Call [Beta Edition] Commander 2016 You draw cards equal toSet: 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.