For example, if you control Johann, Apprentice Sorcerer ("Once each turn, you may cast an instant or sorcery spell from the top of your library") and Promise of Aclazotz is on top of your library, you can cast Foul Rebirth, but not Promise of Aclazotz
On top of that, its also very powerful, which is the ideal combination as far as Im concerned
This is a card good enough to pull you into white, honestly
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A a 4-mana 8/4 is probably a 3.0 or 3.5