yugioh parasite cards Metallizing Type monster as long as this card remains face Parasite Paracide [PSV-003] Super Rare

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

The biggest one is that the game can kind of just

Raiyuu himself has first strike, and he pairs especially well with Asari Captain

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