I like Wildest Dreams for its pleasant mix of power and flexible cost, and I think it will be better than Regrowth for this deck while still being basically Regrowth when that is all you wanted it to be
His second ability is very niche and won't really ever be relevant, but in the pirate deck, as a 5/4 for 5 with Rush and the ability to ready himself, he'll be solid
Exotic Orchard will help you get to the five colors you need more often than not, and is far less expensive than some lands on this list
Stylistically, UAONO leans classy rather than flashy, so it blends in on a shelf or coffee table nice if your gaming space is also your living room
If youre looking to upgrade Riders of Rohan, look no further
Even at the floor, its 3/3 for three that lets you get a bunch of treasure after a wrath