Mizzix's Mastery (Japanese) [Strixhaven: Mystical Archive] Dragon/Fusion destroy all other face-up monsters

destroy all other face-up monsters on the field whose DEF is equal to or lower than this card's ATK

I'd have told you what it was

Set: HeartGold & SoulSilver: Triumphant Type: Water Rarity: Holo Rare Retreat cost: Colorless

−X: Exile each permanent with mana value X or less that's one or more colors

Set: EX: Team Rocket Returns Type: Supporter Rarity: Secret Rare

Mizzix's Mastery (Japanese) [Strixhaven: Mystical Archive] Dragon/Fusion destroy all other face-up monstersSet: Strixhaven: Mystical Archive Type: Sorcery Rarity: Mythic Cost: {3}{R} Exile target card that's an instant or sorcery from your graveyard. For each card exiled this way, copy it, and you may cast the copy without paying its mana cost. Exile Mizzix's Mastery. Overload {5}{R}{R}{R} (You may cast this spell for its overload cost. If you do, change its text by replacing all instances of "target" with "each.")