Mana base is a work in progress, probably cutting the Doom Blade since it serves no real purpose in the deck outside of being an out to Wurmcoil Engine (GftT can't hit it obviously), which the deck can already answer pretty effectively with Path to Exile and Temporal Isolation.  It could be replaced with a Dismember, Far/Away, Delay, Mortify, Hero's Downfall, or perhaps a different removal/counter entirely.  Sideboard is also a work in progress, probably needs a Sudden Death somewhere in the 15.

Delay might have a place in the mainboard as a one of.  Still debating between the Calciform Pools and a Dreadship Reef.

Also potential for a single Grave Titan to be added to the mainboard as a win con.

Testing with 1x USZ in place of Think Twice. (bad)

Voidmage Husher and Draining Whelk still in testing.

Testing Far/Away in place of Geth's Verdict.

Testing BSZ.  (removed Counterbore temporarily)

Testing Rune Snag in place of Mana Leak. (pretty meh, might go back to 3x Mana Leak + one more Cryptic)

Karn Karn.

Temporarily cut Cryptic Command - testing.

Replace Rest for the Weary and Disenchant with Negate + Memoricide.

Considering replacing 4x Rune Snag with 3x Mana Leak + 1x Cryptic Command.

Aura of Silence is also a reasonable option.
Prolly replacing the Repeal with Far/Away

Switched to 2 Hallowed Fountain 3 Island, 4 Island was pretty much overkill and the 2nd Fountain allows the same versatility for T1 Spell Snare on the draw.

Introducing Inquisition + Thoughtseize some time soon, probably switching over to cheaper board wipes, maybe adding Porphyry Nodes in the sideboard.

Probably cutting the Consume for the Inqs, as it's done pretty much nothing and I rarely tutor for it.