You take Gates over anything replacement level, never pass any of the Gates-matter cards, and just make sure you have enough removal
He spoke on it over at Muddy Colors
And it has myriad for ETB triggers to copy like in color Mulldrifter or smashes like in color beater Deep-Sea Kraken
Whenever you learn you can either rummage (discard a card to draw another card) or put any lesson card from your sideboard into your hand
While the "it's slow and bad in a lot of matchups" argument might be reason enough to consider releasing [[Umezawa's Jitte] from Modern jail, it would at the very least show up in sideboards to punish people for playing small creatures
TL;DR: One Piece TCG's official base rarities are Common, Uncommon, Rare, Leader, Super Rare, Secret Rare, and Special, with premium variants layered on top: Alternative Art, Treasure Rare (TR), and Manga Rare (rarest, with very low unpublished odds)