Bucky had said in another thread that he was using this deck for arena, and I'm finding that it works extremely well there, better than any of my other decks I've tried in arena so far. I think there are probably better false god decks, though. When I tried this deck a month or two back on FGs, it had problems with rewind/eternity, anything with momentum, black hole, pests (pre-supernova) and stuff like that. It's an issue in the arena as well, but it doesn't seem to come up as much, since the decks there are of a different style. Also, getting the 200 damage against a FG is sometimes tricky, but most arena decks don't have quite that much. Usually when the combo goes off I'm finding my twins are doing in the 50s-60s damage range each.
I kind of did a 'wtf???' at the hourglass and only 2 gravity pulls, but I haven't had any issues with that so far. The hourglass is nice in the endgame to speed through your deck alongside the sundials if you need one more combo piece, which sometimes happens. It's also one of the reasons 2 gravity pulls seems to be okay.