Here are my strategies for the FGs. Note I play the Entropy pendulum version. Feel free to add input:
Neptune Easy. Play Voodoo + GP, add BB's as they come. Occasionally he plays 3-4 Abyss Crawlers in succession, so you may have to TU your doll early.
Hermes If you get the combo out early you can win. Sometimes I BB a built up Lava Destroyer to give my doll a breather for a few more turns.
Seism I have a hard time with him. He's harder than Obliterator for me - I can't get enough aether quantum to play enough TU's to pull it off. Can still win if he doesn't play a lot of quicksands early.
Osiris One of the easiest of the lot. Since his creatures never do more than 3 damage to the doll, even a nearly dead doll at the end will still do another ~15 damage or so.
Octane As has been stated, you're basically hoping he plays his weapons instead of his Gases. Easy if he doesn't play more than one or two gases early on.
Dreamcatcher Easy. Save your SN's till you need them in case he plays one of his (rare) black holes.
Rainbow Easy. You have no permanents you care about, and his creature build up is slooow.
Gemini Hope he doesn't have a lot of early momentums.
DivineGlory Easy. Keep a BB back if you can afford it to freeze up the MG in the weapon slot.
Paradox If you get your doll out early, it's easy. He can build up damage fast if you're unlucky. The AI is stupid and doesn't save its buffs for the Deja Vus, instead casting it on whatever. Occasionally it gets lucky and realizes that Blessing + Twin Universe on an unsplit Deja Vu = Win.
Darkmatter Auto-Quit. I've beat him maybe once in 30 games before I just saved myself the hassle. Black Hole + Gravity Nymph destroys you.
Destiny I have a hard time with the mutate gods. You can't even twin the good mutants because he will just rewind them! Maybe someone has a better idea than me.
Firequeen Get the combo out early and it's easy. Wait too long and the bonds will prevent you from finishing her off.
Scorpio Easy.
Morte Easy.
Incarnate Easy. Sometimes you get unlucky and he plays a lot of pests + eclipse early.
Miracle Easy. Make sure you have enough damage to kill him in one go. You can get him to about 60-70 HP remaining before he thinks about playing Miracle.
Graviton: Hope he plays an early momentum'd Oty - TU it, then eat a charger, then eat firemasters. Otherwise, quit,.
Obliterator Slightly different strategy. TU his Momentumed creatures, then BB them. It's important you wait for them to be Momementumed, or his shield will hurt you too much. A doll plus GP will soak up any creatures he plays that aren't momentumed. Also, he burrows his shriekers like an idiot. Will GP a vanilla doll, so don't sweat not having one in your starting hand.
EternalPhoenix You need a good draw, and hope he doesn't pop out too many ruby dragons. Watch his aether quanta and assume that whenever he's going to hit 9 he'll play a fractal for another 4 or so phoenixes - that's 16 more damage; plan accordingly.
Decay I auto-quit. You CAN beat him if he plays eclipse early, but the problem is hoping to get enough aether quanta to play your TU's. Not worth the guessing games (you won't know if you can win until turn 8 or so)
Chaos Lord: Twin the good mutants, BB the druids, hope you get lucky. No rewinds unlike Destiny, so playable.
Ferox: Get your doll + lots of BB's out early. If he plays 3+ bonds, you're probably toast.
Elidnis: Like Ferox, but slower. Gives you more wiggle room.