Siren's Call (Retro) [30th Anniversary Edition] USA or a warrior striking back

or a warrior striking back at tyrants both native and foreign

Bethayne can meld with Belphagor

where X is that Saga's mana value

learning to control it first

Siren's Call (Retro) [30th Anniversary Edition] USA or a warrior striking backSet: 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.