Yawgmoth's Will is a good way to rebuy your graveyard and get some extra use on your rituals. Brain Freeze might be too janky but Im sure someone has tried it. Tezzeret the Seeker/ Voltaic Keycould make something happen?
How about Pemmin's Aura? Throw it on something with decent toughness and you can mill + untap a bunch just before your next turn. Also lets you protect stuff from spot removal.
pemmin's aura is bonkersly good, it was in our infinite mana combo deck.
umbral mantle would also be a good finisher with a creatureform phenax, especially because you can respond to your own ability by pumping and untapping.
Any uptap is awesome. Slagwurm Armor -> mill alot + Crab Umbra -> protection and untap. I think you'll find you just need large dumb creatures like Wall of Air, Hunted Horror, Drift of Phantasms and and the like. Slag, Hunted, Crabumbra, attach slag, cast Phen, turn six you can mill for 26+7. I will bet you will hold nemesis of reason back as a fat blocker and mill at end of turn for 7, instead of attacking for 10mill.
You've got tons of U/B mana symbols in your permanents. Seems like throwing a few devotion cards in here would give you some good value - Gray Merchant of Asphodel, especially.
Gary as we lovingly refer to him is on my "I hate this card" list. Even though it makes sense I refuse to play him. Devotion makes alot of sense, Phenax, God of Deception would be good here.
Yeah he's def. annoying. It's just such a huge swing if you have like 4 devotion or so. I'd also cut a few other cards here:
Lurking Informant
Unsummon
Mana Leak
Duress
I don't think these'll be that effective in EDH.
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umbral mantle would also be a good finisher with a creatureform phenax, especially because you can respond to your own ability by pumping and untapping.
Lurking Informant
Unsummon
Mana Leak
Duress
I don't think these'll be that effective in EDH.