The two-color cards in a wedge set want to be enemy-color cards, as that's what is supported in a wedge-focused Limited environment
While the set was solid from a competitive standpoint, it lacks a little from a collector's point of view, though the Tyranitar V alternate art card has topped over $100, which would be a great pull
Not a basic land, mind, any forest of plains
Grakmaw, Skyclave Ravager
The maindeck is pretty solid so I wouldnt change anything there
The gameplay also very loosely resembles that of the Digital Monster Card Game and includes some of the same structure and concepts, but is much simpler and features many differences and new mechanics