Bundles and gift bundles include the promo alt-art version in foil alongside the other three cards depicting the scene where the ring is cast into Mount Doom
The biggest one is that the game can kind of just
Is it just a few points, like my M:TG decklists, or are you going for a super-detailed database like my HeroClix one
The second one has the Promo Cards featured in special Chansey and Bonus Wonder Picks, so players can get one card for free or in exchange for some Wonder Stamina, depending on the pick
This isn't to say there won't be players playing mono-colored or everyone will be playing Reaper King because their favorite color-combination is underrepresented, but that prEDH restricts cards not just by set, but also much more heavily with color as well which can result in a poorer deck diversity than modern day EDH
Cool Pokmon that don't have an ex card yet include Shedinja, Goodra, Regigigas, and Pinsir