Siren's Call [Alpha Edition] Legendary Enchantment Set: Duskmourn: House of Horror

Set: Duskmourn: House of Horror Type: Enchantment Creature — Elk Glimmer Rarity: Mythic Cost: {1}{G}{G} Vigilance

or from among cards you own in exile without paying its mana cost

Set: Zendikar Type: Artifact Rarity: Mythic Cost: {6} Eternity Vessel enters the battlefield with X charge counters on it

then you may return a creature card from your graveyard to your hand

Siren's Call [Alpha Edition] Legendary Enchantment Set: Duskmourn: House of HorrorSet: 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.