Siren's Call (Retro) [30th Anniversary Edition] BW56 Set: Sun & Moon: Cosmic

Set: Sun & Moon: Cosmic Eclipse Type: Fire Rarity: Ultra Rare Retreat cost: Colorless

−1: Exile target nonland permanent with mana value 1 or less

If more than RRR is spent in this manner during one turn

Set: XY: Generations Type: Fire Rarity: Common Retreat cost: Colorless

you'll understand why

Siren's Call (Retro) [30th Anniversary Edition] BW56 Set: Sun & Moon: CosmicSet: 30th Anniversary 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.