Siren's Call [Alpha Edition] Modern Masters 2015 "Her hunger knows no limit

"Her hunger knows no limit

Shamans of Kar-Sengir claim that their sun sets because it can no longer bear the gaze of those pain-carved cliffs

you may sacrifice an artifact

If you do and they guessed wrong

Siren's Call [Alpha Edition] Modern Masters 2015 "Her hunger knows no limitSet: 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.