Well, since wardens are the nastiest CC damage spamers outside of flow owl's eye, maybe just moving it to a different element?
That would make void angels require a trio so it would make it about as tricky to pull off as wardens.
Thematically, Entropy has good connection with inversion so that seems like a good choice. (I'm not sure, but I think this would actually work in combo with singularities... ugly
)
Aether seems to have a connection to magic and mind. Also, the aether dark hybrid was dubbed "null" so thats an interesting connection.
Death could be an interesting pick too (incidentally this could subtly counter purify healing since purity status on the opponent actually triggers on your turn)
I could see having an evil / deranged priest inside any of those 3 elements.
