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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
That said, the possibility of opening one does increase the overall expected value by a few dollars
If Commander politics somehow leave the table all choosing the same number, everyone takes damage, and nobody draws new cards
You can keep up to date with the MtG release schedule with our guide