I've done it with...

3x dk (season 9 though)
warrior + ret
dk + ret
dk + dk
mage + mage (lol double shatter + deeps)
dk + warrior

Been meaning to try enhance but i have enough trouble playing arena on my 4 dks right now post 2200 pushing for glad that I just don't have time.

Agreed though, you can get carried to 2200 in RBGs in like 5 games.