Name: Wasteland Scorcher
Ability: Tainted/Infused Purge
Seeing as his ability is basically cleansing with fire, maybe Wasteland Scorcher would be a fitting name. Setting the battlefield ablaze and leaving nothing behind.
"Wasteland" definitely needs to stay, though!
For the ability name: the fact that it's a dragon probably means nothing it does is very gentle. "Cleansing" debuffs from units sounds too nice and caring and gentle, so I propose that he purges them instead. This also fits with my reasoning for my proposed name.
And yeah, I would crop the image a little more, even if it cuts off most of the wings. It being zoomed out like this makes him look smaller than a Windhunter even, which I'm sure he's not.