If our MaroMaroes are capped at 7/7 at the end of our turn, there are plenty of other strategies that can simply go over the top of our creatures, and that's not where we want to be
So that's why Ajani, Mentor of Heroes is so valuable
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
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Until next time, resolve those spells with no fear