I'd cut a firebrand or two for more wildfire imps. They are pretty dang amazing for Domination.
In addition, I recommend dropping some of that armor. Most of the time you won't need in Domi, if you're worried about burst damage then put in some Brace Yourselves and try to outlast them, which is what will probably happen if you're playing for orbs and they aren't.
Also, some elusive cards will help out. Once they kill a slack you can teleport an imp over and smack the orb past their guard to deny them those valuable v'tar.
Looks fun, let us know how it goes!