It’s definitely a fun idea if nothing else. Here are some tweaks I’d make,

+1 teshar

+1 sentry

+2 sai

+1 Serra

-1 tomb

-1 tome

-2 compass

-1 pack beast

Legendary_penguin_of_death: Awesome, thanks for the advice! I'm gonna make those changes and test it out in MTGA this afternoon. I'll report back with the results.

Legendary_penguin_of_death: I only had time to play one game, but the deck actually held its own. I went against a Selesnya deck, and they played Carnage Tyrant, Mentor of the Meek, Siegehorn Ceratops, Nullhide Ferox, Shalai, Voice of Plenty and Dawn of Hope. I managed to get out a Teshar and two Gleaming Barriers and kept bringing them back from the graveyard to block their Tyrant and ramp with the Treasure. Once they played their Ferox, I Board the Weatherlighted into the second Sentry I needed (accidentally exiled the other one...) and combo'ed off with a Serra Disciple on the field, winning the game.

Those changes made it feel much more consistent, but the deck doesn't feel like it does much until then. I think I'm gonna add more controlling cards like Plaguecrafter (which should be awesome with Teshar) and Settle the Wreckage or Citywide Bust.

Plaguecrafter seems super sweet! I tried a UW teshar deck back in dominaria standard and I tried Settle the Wreckage but wasn’t impressed because the it is unnatural to not spend 4 mana in a deck that doesn’t have other instants (it is good against bad players because they won’t know to play around it, but even intermediate players know not to swing big into 4 open mana if it includes WW. I might try Slaughter the Strong instead of the two you mentioned because your creatures are low power but a decent amount have 4 toughness.

Legendary_penguin_of_death: That's a good point... I put in two Slaughter the Strongs and I'll try it out tomorrow. I just played one more game with the Plaguecrafters, and it cleared their board of Knights and almost removed their hand before they conceded. I updated the decklist I'm using.

Wand of Vertebrae was only good if I was trying to find the last of my combo pieces. I replaced them with Navigator's Compass again. I want to see if they'd be a good target for Rona, Disciple of Gix for some life gain (after sac'd with Sai, Master Thopterist). They also fix my mana, and help me get to 4 or 5 colors if I want to full-cast or return a Chamber Sentry.