A couple of the new Black Mage cards from MTG Final Fantasy are seeing play there already, across multiple decks
Both provide buffs to other flying creatures, increasing your capacity to deal damage in the air
Its worse as a 2/1 without an ETB, but once you get your +1/+1 counter engine going, you can recur a big chunk of your graveyard
Not only will you disrupt many of your opponents plans, but youll get a ton of +1/+1 counters and draw a bunch of cards with Korvold for your troubles
One Piece is by no means a small franchise, being one of the longest-running and most popular Japanese anime and manga series of all time, but I doubt any would have expected the truly meteoric rise that the One Piece Card Game has seen over the past year or so
It doesnt have the strength or focus of a one or even two-color deck, but also doesnt have the bountiful mana ramp and fixing of green