This is potentially the Oko, the Trickster of Streets of New Capenna, justifying its price and its two different positions on this list
Is it the most competitive deck you can make for $700
Take his first ability which doesnt outright kill an opponent's creature, instead negates most (if not all) damage done by it
Switching out his background is a shame since Folk Hero works so well, but Raised by Giants is a solid choice to improve the deck's color identity by providing access to green.
Captain Rex seems like an incredibly unique and interesting commander to build around, and hey, you dont need to know anything about Attractions in order to run him
But with counter doublers like Lae'zel, Vlaakith's Champion and proliferate triggers, youll have no trouble turning your 2-drop commander into a board wipe that threatens lethal damage with just one attack