Duskmourn: House of Horror Promos · #188
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If this card is in your opening hand, you may begin the game with it on the battlefield. You may pay {W}{U}{B}{R}{G} rather than pay the mana cost for spells you cast.
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Leyline of Mutation (PDSK-188p prerelease stamp) is an enchantment promo from Duskmourn: House of Horror Promos. If it’s in your opening hand you may begin the game with it on the battlefield, and it lets you pay WUBRG rather than a spell’s mana cost. The replacement-cost effect interacts with X costs and alternative-cost rules as clarified by its official rulings.
Catalog pricing data as of 4 May 2026, 22:06
