perona one piece card game [Japanese] / ペローナ(3rd ANNIVERSARY SET) OP12-034 SR [Activate Wano Perona | One Piece

You do get a reward in the form of an infinite and automatic copy effect, which can snowball very quickly with the right setup, although you still dont necessarily win the game outright after transforming

The stained-glass treatment is also applied to legendary creatures in the set

Since many rats are also black, you can use black-specific anthem effects to pump up your creatures, too

As far as board wipes go, this one gets to be pretty aggressive and pairs nicely with cards like Bloodletter of Aclazotz that double life loss

It is important to note that you cannot cast one half of a split card and then choose to cast the other half on another turn