Though, we can't imagine you'd be playing with an Enchanted card
Or if you are, you can split the difference with your lands, still making Treasure Cruise an extremely efficient way to draw cards in Commander.
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
If the Octomancer can live to the end step, you then get parity on that large creature, and anything else you get in subsequent end steps is pure upside
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
Summoning Trap: I want to try it out if it is reasonably priced