This is exactly what I was planning on doing lol. It's probably going to be tied to general xp and be a level up thing though.
Thanks for making me feel better about the idea! There are a few ways of doing it (ie relic pickups like RoR2, discrete choice Stat upgrades like Diablo, skill tree etc) but I think the pool is best for this game since it'll be multiplayer and it'll mitigate meta builds