The only downside is that Water Arrow costs three Energy to use, but you can supplement this with Misty
While other cards over the years have featured effects similar to this (mythic rare Zur, Eternal Schemer from Dominaria United comes to mind), Opalescence was the first to do it en masse for enchantments, and, due to its novelty and being first on the scene, it clocks in with a price point approaching $30
The word "triple" on City on Fire is all I need to see to be convinced that this will be a Commander and casual hit
I almost wish I could make room for Doubling Season and Primal Vigor because making a token of something is kind of like doubling it, and if you double your doublers, your doublers double and then things get kind of ridiculous
If you're not a fan of this style of Blaziken, there's another fantastic version to come that might strike your fancy