Mizzix's Mastery [Strixhaven: Mystical Archive] Metal[-20] bearing purity seals: these are

bearing purity seals: these are filled with progenoid organs that have passed his scrutiny

Cradle of the Golgari's new kingdom

create two 2/2 green Ooze creature tokens

and Iliona—the Vendilion clique—on the gravest of tasks

Mizzix's Mastery [Strixhaven: Mystical Archive] Metal[-20] bearing purity seals: these areSet: 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.")