I tried to do this strategy, and it also happened to be the daily. Minixis was using "Antaen Cannon" which has a 100% hit rate, AND does 2875 damage.... so i was forced to use a dodge ability first. The Frostwolf Ghostpup has 2 great abilities to mitigate this ability. Then used standard Unborn Valk Doom>Haunt, then switch to pet with debuff + swarm ability. Won Daily with ease.
He always has Antaen Cannon. This works because they're undead pets, and Val'kyr is faster therefore Doom -> Cannon Hits -> Undead Phase -> Unholy Ascension (its not haunt so it can be used during undead round) You don't need a dodge pet in the first slot.
Done it with Val'kyr, Macabre Marionette(x-x-1) and Mr. Bigglesworth(x-2-2). Start as above, then swap to the Marionette. Use Dead Man's Party until the Marionette dies, then swap in Kitty. Use Frost Nova then Howling Blast.
Send in valk
Curse of doom
Send in graves
Clobber (could likely skull toss here and clobber next round but I did it this way)
Graves dies / comes back
Skull toss (enemy wastes laser yew!)
Graves dies for real
Send in ghastly kid
Diseased bite till enemy dead