With Energy and Mox being my favourite costs, I'm really hyped for this patch. I'll test this as soon as I get home, will comment if I get any bugs.
Regarding balance: I know you said you'd worry about it later as it really doesn't matter now, but I don't think Undead Cat should be in there. It's too strong and is never collectible in any of the Acts, so I don't think anyone would mind if you removed it.