I read and I still think it costs far too much.
- Unstable Gas deals considerably more damage (since although Hope costs 8 upgraded, most shields cost less)
- Unstable Gas does not require a shield
- Unstable Gas does not require stall to work (this does if you want to play all 6 cards together)
- Unstable Gas does not destroy your main defense
- Unstable Gas deals considerable CC
- Unstable Gas does hit your creatures
So to use them all at once you need to play like a firestall - except you don't need to keep all the quanta - or an Unstable Gas deck. This isn't actually what I would call OP: in fact, I still believe this card is UP.