Urza's Ruinous Blast [Dominaria Prerelease Promos] Merfolk Mutant {T}: Add {B} or one

{T}: Add {B} or one mana of the chosen color

it gains "Whenever a land enters the battlefield under your control

Set: Strixhaven: School of Mages Mystical Archive Type: Instant Rarity: Uncommon Cost: {1}{W} You gain 3 life

Set: Innistrad: Crimson Vow Commander Type: Land — Swamp Mountain Rarity: Rare ({T}: Add {B} or {R}

Set: Black & White: Base Set Type: Grass Rarity: Holo Rare Retreat cost: Colorless

Urza's Ruinous Blast [Dominaria Prerelease Promos] Merfolk Mutant {T}: Add {B} or oneSet: Dominaria Prerelease Promos Type: Legendary Sorcery Rarity: Rare Cost: {4}{W} (You may cast a legendary sorcery only if you control a legendary creature or planeswalker.) Exile all nonland permanents that aren't legendary. Centuries ago, one man's vengeance plunged the world into ice and darkness.