This is a really cool idea, but I would make the Ravenous Ghoul gain more attack/hp than Hungry Ghoul. This really suits 
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all the other growth creatures have the same ability across upgrade so i thought i should stay consistent to that, plus its harder to balance while making it better. if i did change the ability for the upped, it would probably be 10 HP for +4 | +4 so its like youre using it twice.
