Hmm....
Definitely needs fixing, yeah.
After thinking it's possible to 2 TTW, which is taking things too far.
Opening hand 2 Nova 2 Towers 1 PU 1 Voodoo 2 BB
Play Novas/Towers. End turn. 7
, 2
, 2
, 2
. All you need.
Next turn, draw a Weaken.
Play Voodoo, drop 2 BBs on it. Weaken does 59 damage. PU doubles 59, doing 118 total, which is completely unstoppable.