Siren's Call [Alpha Edition] Modern Masters 2015 Activate only if Glory is

Activate only if Glory is in your graveyard

you may sacrifice an artifact

War destroys hope

these devices doubled the output of Amrit Vatyam's forges

revealing the enemy's positions

Siren's Call [Alpha Edition] Modern Masters 2015 Activate only if Glory isSet: Alpha 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.