which champions are good with rageblade

Kayle, teemo, and probably kogmaw i dont know about the new kog though

Any attack speed champion with On hits and magic damage somewhere in their kit. In my opinion.

No

rageblade is pretty crap now since they increased the cost then removed the 2x melee stack and aoe proc

I'd probably say only jax because of his all in style and innate attack speed generation combined with his cc, you can probably max out in 2-3 seconds