op-09 booster box english One Piece Trading Card Game The New Emperor Japanese – Calipokehouse English】One Piece Card Game Emperors

So while cards can still go in, they wont be able to activate any effects that require them to banish themselves from the graveyard

Mono-color decks lose a lot by not playing additional colors, so giving them a little extra push seems perfectly fine to me

[10] Main Phase 1 : The turn player may perform any of the following actions: [10] Normal or Tribute Summon a monster in face-up Attack Position (the monster is placed face-up on the field, oriented vertically), or Normal or Tribute Set a monster in face-down Defense Position (the monster is placed face-down on the field, oriented horizontally)

Also remove all copies of that card from controller's library and graveyard