This is the standard playing card size used by Pokmon, Magic: The Gathering, and newer Bandai card games
For me, Belle is actually one of my favorite cards from The First Chapter from a playability standpoint at well, with two fantastic abilities
But the other issue is that even when Oloro isn't on the battlefield, this fool is still gaining life
If you have a big token creature you can copy, this gets better, but still solidly C tier
This is where the shenanigans can spiral out of control, with cards like Millennium Calendar and Champion of Lambholt giving you incredible value
Some things, like Scry and Planeswalkers, have been and will be around for a long time, but theres only so much design space to be mined