Hmm, I had me thinking, this morning at school, that a counter deck played against FGs may have a decent FGei, even though it won't probably keep up with Firecell, this is a nice option for a little fun and, if you need it, score drop.
Let's pick a Divine Glory counter (let's assume it has 100% Winrate, even though that's not possible) (let's also assume that the deck has a 100% EMRate, and that should pretty much accurated, it should be avoided to pick a deck with a low EMRate) (Divine Glory is pretty easy and has the higher extra electrums per win amongst Gods, so it should be the best pick)
Kev showed that Divine Glory's extra electrums per win is 873.
With a total of 29 Gods, 28 are auto-skips. Let's assume that the time for a skip is 2 seconds.
You lose 30 electrums per loss and win 120 per win plus the spun cards it'll be 993 Electrums/Win.
/s=(993-30*28)/(2*28+240)=0.51689189189
0.51689189189*3600=1860.81081081
/Hour
I assumed a pretty slow TimeToWin, 240 seconds.
As a side note, playing the deck will result into a score drop of:
(120-30*28)*3600/(2*28+240)=-8756.75675676 Score/Hour
However, even though this is mostly theoretical, I wished to write this. If a valid, unupped, counter to two or three decks appeared (and that's most likely something among the lines of MonoAether) with a good Win Rate (>80%), it may result into a nice FG farmer.