one piece 10 booster box TCG [OP-10] Royal Blood (Japanese) – Card Piece decks built around the new cards are powerful enough to give newcomers a chance to compete with experienced players! One Piece: Royal Blood Sleeved

A few things to keep in mind, for potential synergies

The biggest risk is that the fast mana it gives would power up combos too much, and while it's probably safest to have Chrome Mox banned, it does seem strange to see it on the banned list after watching Affinity play Mox Opal on Turn 1 and dump literally their entire hand onto the battlefield

Koma offers something different compared to other Simic Legendaries as it cares about interacting in combat, rather than unloading your hand with lands to draw more cards

Whenever you sacrifice a token, target opponent loses 1 life

They gain menace and haste until end of turn

So naturally, getting to cast spells more than once would greatly aid a control player