Outside of exile effects, the worst that can happen with Ojer Taq, Deepest Foundation is for it to become Temple of Civilization for a few turns
Use the number of noncreature, nonland cards in your graveyard as Summon: Esper Ramuh's first chapter ability resolves to determine how much damage is dealt
He serves as a cheap, easy tutor for your best auras and equipment, and then makes the perfect target for equipping them once he comes out as a creature
Two of them -- Slinn Voda, the Rising Deep and Whelming Wave -- bounce non-Sea Monsters, and the third, Scourge of Fleets, only bounce opposing creatures
And since you can tap your commander to untap Leyline Dowser, that can happen whenever your commander doesn't attack for the turn (or do anything else that requires tapping)
With that, however, I think we've found all the stuff we're not interested in, and are ready to get to the list