what is the one piece card game P-001 Monkey D. Luffy One Piece Cards Pack Bundle:

Back in 2019, one of WotC's stated goals for Pioneer was to provide a non-rotating format where Standard cards would rotate into by 2019, Modern's card pool had become so large that it no longer served the needed role of format where you can use your Standard cards after rotation. Pioneer was designed as that retiring home of sorts, where Standard cards could see play after being rotated out

Every card in the set past #271 is either a basic land, alternate art, or a card from either the Beginner Box or Starter Collection (which are separate products for teaching brand new players and providing an initial collection of Standard cards)

Most notably was that it was meant to represent a card known as Zilortha, Strength Incarnate

Its an incredibly potent ability, and an essential card in any deck that has a decent number of Plains in it