Since Earth at least has one pumpable spell, it's more useful than Damselfly, but I still don't use Gnomes. If they had 2|2 (which Damselfly and Brimstone Eater would also get in that case), I probably would.
As for needing.. well, they get the benefit of fuelling a pumpable spell in exchange for having less attack and more HP than the other two generating weaklings. Compared to Brimstone, they fail big time. But on the other hand, who says they all need to be as good?
All in all, I support an attack of 2. Would rather have 2|1, but it doesn't fit Earth so I doubt that's going to happen.