I think SB is correct because Hope gets much better when they board out 1cmc spot removal, and it also promotes slow-rolling which is less necessary in G1s, but this needs testing.
Pithing Needle also deserves testing in the SB. It can be cast off either land and shuts off cards like Crypt & Faerie.
Bridge works with multiple Therapies to enable multiple free discard before casting Dread Return (up to 4 Narcs + 4 Zombies to sacrifice), in case they're holding a lot of hate or you have both DR and Thassa stuck in hand. It's also insurance in case of a Narcomoeba shortage (3 bodies is now enough to both DR + Therapy).
Traditionally Bridge and Cabal Therapy are bad in the opening hand, but now that's somewhat offset by being able to imprint them on Chrome Mox or pitch to Unmask, and Cabal Therapy can be hardcast on Agadeem hands without losing mana. Adding Unmask + Agadeem reduces the downside of drawing Therapy. Therapy can take Bridge out of your hand if you need to, and Bridge supports multiple Therapies post-Hermit. I think that's enough to make them worth running, but needs testing.
I started with 4 OUAT for that reason, but after running the math on it I think it's a trap.
In testing, when do you use OUAT? What do you get?
Do you ever use it to dig for a Hermit when you don't have one? In those hands, your odds are almost always better by mulliganning than casting OUAT.
If you mainly use it to get a mana source, wouldn't it be better as a mana source instead?