Unstable Mutation [Arabian Nights] Legacy of the Valiant if this card battles a

if this card battles a Pendulum Monster: Destroy both that monster and this card

if you control ten or more Treasures

Exile those creatures at the beginning of your next upkeep

Set: Dominaria Prerelease Promos Type: Legendary Creature — Leviathan Rarity: Uncommon Cost: {6}{U}{U} Kicker {1}{U} (You may pay an additional {1}{U} as you cast this spell

Set: Deckmasters Type: Enchantment Rarity: Rare Cost: {B}{B}{B} Skip your draw step

Unstable Mutation [Arabian Nights] Legacy of the Valiant if this card battles aSet: Arabian Nights Type: Enchantment Aura Rarity: Common Cost: {U} Enchant creature Enchanted creature gets +3 +3. At the beginning of the upkeep of enchanted creature's controller, put a 1 1 counter on that creature.