one piece tcg card game Promotion Pack Vol.9 (Japanese Exclusive) – Piece Includes Six Leaders with New Effects One Piece Cards Pack Bundle:

Even ignoring that you dont need access to green mana to play Top, its just an awesome enabler for some of the most powerful cards in Cube that rely on a high volume of artifacts: Beyond that, Top can immediately cash in for the card back at the cost of no life

Formats like Standard and Pioneer may be about to have a token/convoke problem

Carmen, Cruel Skymarcher Carmen, Cruel Skymarcher exploits players sacrificing creatures by becoming a massive threat that generates lots of grindy value over the course of a game

Even out of the box though, Bellos deck is very cute and pretty powerful, so that might be worth the price of entry alone