Mizzix's Mastery [Outlaws of Thunder Junction Commander]

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 5RRR (You may cast this spell for its overload cost. If you do, change its text by replacing all instances of "target" with "each".)