Siren's Call [Collectors' Edition] Artifact Land Only magic of great power

Only magic of great power can start its eldritch resonance

Set: Shadows over Innistrad Prerelease Promos Type: Creature — Hydra Rarity: Mythic Cost: {4}{G}{G} Reach

Set: Alliances Type: Instant Rarity: Uncommon Cost: {4}{R}{R} You may exile a red card from your hand rather than pay this spell's mana cost

Set: Alpha Edition Type: Creature — Elemental Rarity: Uncommon Cost: {3}{U}{U} Unpredictable as the sea itself

Siren's Call [Collectors' Edition] Artifact Land Only magic of great powerSet: Collectors' 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.