For me, Belle is actually one of my favorite cards from The First Chapter from a playability standpoint at well, with two fantastic abilities
The World Shaper precon with Hearthhull, the Worldseed at the helm, for instance, is an incredibly powerful deck
Ganax makes a [cad]Treasure[/card] token whenever it or another dragon enters the battlefield
If Jo gets big enough, she can be a wincon, but shell at the very least serve as a decent blocker while accruing our value
Don't believe me
With an end of turn fetch, you get to spend the mana of a Triome entering the battlefield tapped at your convenience, and once you have a Triome you can basically assemble any two or three other lands you want and just cast the spells in a four-color combination