It's pretty OP and I wouldn't be surprised if this gets nerfed in the next hot fix. Anyway his AOE 2 second rez ability can actually work on himself, so you couple that with the passive Many Doors, which spawns a doppelganger of the character that is rez'd, and the prime item "Canadian Flavored Jaw Breaker", which halves cool down times.
Now, that in itself sounds good, since every time you're downed you get a dopel, BUT it turns out your dopels keep your passives and will also use the rez ability if a friendly gets downed near them. This is where it gets fucked, because if a dopel gets downed, it can be rez'd by another dopel, and thanks to Many Doors, it'll spawn another fucking dopel!
I'm not sure if this is just an oversight or intended, but I've seen a single Heal Plank take out the Nightmare Kanker raid boss in 3 minutes using this. Yeah, they're doing like 2 damage per hit, but with the exponential growth of dopels, that shit stacks FAST.