About The Curator (Hero Power – Menagerist), I think it’s more interesting if change it like Lichking, such as, Cost 0 - choose a minion and its minion type become ALL until next turn.
The same way for N’zoth. Such as, Cost 1 - choose a friendly minion, it gains deathrattles … until next turn. Or, Passive - your most right side minion gains deathr… during battle.
Maybe there’re some other heros I don’t remenber whoes hero powers are Start the game with some tradeable minions, I think Enchant skills are much more fun. It saves one slot, and nobody can steal their unique minions.