You can substitute any of the DK Whelpling pets for the Voodoo figurine as well. I used Vilebrood Whelpling for the Plague Breath, as it didn't have a dmg variation like Flame Breath on the Bloodbrood Whelpling. My Frostbrood Whelpling wasn't leveled, but Frost Breath would likely work.
TL;DR Vilebrood Whelpling 1/2/1, Bloodbrood Whelpling 2/1/2, or Frostbrood Whelpling 2/1/2
Use Plague Breath/Flame Breath/Frost Breath in Turn 8.
So, because I accidentally tried one of the strats (originally created by Ninety) for Mar'cuus on this battle, I can tell you it works with only one change in the script. xD
If you're too lazy to go to the other page, here's the set-up:
Mr. Bigglesworth (1,1,1)
Sen'jin Fethish (2,2,1) OR Voodoo Figurine (2,2,x) (I used Voodoo Figurine)
Turn 1 Pass - your Boneshard is forced in
Turn 2 Blistering Cold
Turn 3 Chop
Turn 4 Pass - your Sen'jin Fetish is forced in
Turn 5 Wild Magic
Turn 6 Flame Breath
Turn 7 Pass - your Mr. Bigglesworth is forced in
Turn 8 Claw
Turn 9 Ice Barrier
Turn 10 Pass
Turn 11 Claw
Worked 1st time, although substituting the Weebomination with Corpse Explosion didn't exactly play out as planned. The Explosion left Blood with 107 HP which he healed up to 229. Fortunately my Valkyr still had a good health pool and managed to finish him off with a Shadow Slash combined with the ticks of damage from the Explosion.
If necessary: Dead Man's Party again, or clean up with Ghastly Kid's Hoof.
Modified TheRealLuft's undead + undead + beast strategy (here) into an all-undead team w/slightly adjusted rounds.
*H/H Infested Bear Cub would be better, and other Undead with Corpse Explosion MIGHT work, if substituted (list).