one piece 10 booster box TCG [OP-10] Royal Blood (Japanese) – Card Piece This Collectable Product Is Not A Toy And Has The Possibility Of Containing Small Parts One Piece: Royal Blood Booster

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

A few things to keep in mind, for potential synergies

They gain menace and haste until end of turn

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

Todays entry will be significantly different than previous entries

Ignoring the graveyard until it is too late