Kyurem EX (30/101) [Black & White: Plasma Blast] 11 you may change "swampwalk" to

you may change "swampwalk" to "plainswalk

(Each {B} in the mana costs of permanents you control counts toward your devotion to black

Set: Theros Beyond Death Promos Type: Creature — Merfolk Wizard Rarity: Rare Cost: {U}{U} When Thassa's Oracle enters the battlefield

you might as well trade it for something else

Set: Oversize Cards Rarity: Rare Sacrifice a land: Add to your mana pool one mana of any type the sacrificed land could produce

Kyurem EX (30/101) [Black & White: Plasma Blast] 11 you may change "swampwalk" toSet: Black & White: Plasma Blast Type: Water Rarity: Ultra Rare Retreat cost: Colorless,Colorless,Colorless