Siren's Call [Alpha Edition] Legendary Enchantment I gird them in armor

I gird them in armor and let them loose

defending player sacrifices a creature with the least power among creatures they control

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

and the salt disappeared

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

Siren's Call [Alpha Edition] Legendary Enchantment I gird them in armorSet: 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.