I'd skip the Steals. It's hard enough, and AI fails with it. It's going to Steal when it has a Titan/Shield played and be all dumb about it. Also gonna Quint before TU a lot, but Aether mark would help with that due to gaining enough quanta to play TU as early as Quint.
It's very hard. I can only see Quinted Purple Nymph being a consistent counter. Eternity would sorta work if it doesn't have Steals, and Squids could possibly work, though you'd have to Quint them. Horrible quanta strain on your ass. It'd be like Hermes; requires a specific deck to beat, except this is easier to specialise against. I can't condone more FG's like that, 'cause I want general anti-FG decks to work.