Power level wise the card fits in just right in Modern, as there are a lot of threats which go under the card, and cards like Veil of Summer and Cavern of Souls give slower creature/combo decks enough counterplay against it
The Psychic-type Legendary comes with the powerful Transfer Break ability, which can dish out over 160 damage to an opponent with just three energy
What Do The One Piece Card Game Rarity Classifications Mean
Mark Rosewater has gone into elaborate detail on double-faced cards on his Drive to Work podcast - I would recommend checking this one out for the history of the mechanic
Although I find myself tapping my upper thigh more often than other people probably do, a wallets ability to disappear from consciousness is worth that awkward tick
However, when using or being used by permanent meta-type cards, if you fight between lower-class monsters, you will have a weakening effect with 18 RBI (one counter will pass 20 RBI such as Insp, and two counters will equal 24 RBI)