Mizzix's Mastery

Sorcery    (CMC:4)

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 (You may cast this spell for its overload cost. If you do, change its text by replacing all instances of "target" with "each.")

065 PZ1 • ENDan Scott

™ & © 1993— Wizards of the Coast

Notes: TODO: Check rarity

Legal in: Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Singleton 100,Commander

Oracle Text (click to copy):

11/4/2015
If Mizzix’s Mastery exiled multiple cards, you may cast the copies in any order. The last copy you cast will be the first one to resolve.
11/4/2015
If you don’t cast one of the copies (perhaps because there are no legal targets available or you don’t want to), the copy will cease to exist.
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Mizzix’s Mastery is still on the stack as it resolves. If you pay the overload cost, Mizzix’s Mastery won’t be exiled or copied.
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The copies are created and cast during the resolution of Mizzix’s Mastery. You can’t wait to cast them later in the turn. Timing restrictions based on the copy’s type are ignored. Other restrictions (such as “Cast [this name] only during combat”) are not.
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If you cast a spell “without paying its mana cost,” you can’t pay any alternative costs. You can, however, pay additional costs, such as kicker costs. If the card has any mandatory additional costs, you must pay those.
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If the copy has  in its mana cost, you must choose 0 as the value of X.
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The cards remain exiled no matter what happens to the copies.