Wow. Still don't play LoL, but you've managed to carry over a lot of the design aesthetics into Warcraft appropriately; looks like it fits somehow. Love the shiny double-mega-barreled gun. : )
Personally, the Portrait seems weird (eyes bugging out for me in viewer), and you could make the Dissipate better (let his arms & head dangle while he rises slowly, like the other heroes), but... Yeah, not bad.