It's fine we all miss things. Thank you for your explanations they alleviate my concerns for the sheets as long as it's made clear Golem and Regeneration are high-cost. If Petrification isn't going to be used much anyway, I'd rather it be discarded. I just want Golem to be on the same level as say Zaphkiel when in stone and now he sounds reasonable enough. 

Just include all the weakness, drawbacks, and limitations discussed and we should be good to go.