You can check out our guide on how to build an MTG Commander deck to see how much to stick in there, as well as how many MTG lands, removal, or MTG mana ramp cards you should include
one of the most valuable skills for this set in general is knowing when to save your cards to rummage away (or if you need to discard to Bloodsworn Squire or an enemy Mindleech Ghoul)
Oketra the True is a fine card for the deck, but I like pretty much all the other four-mana cards better, so it gets the boot
This card will be a Cube staple across multiple power levels for years to come
It can find a triome, a shock land, or a surveil land, making these specific land type cyclers deceptively capable of finding any color
Its very satisfying to build an engine for Teysa to call shots from