Setup: Young Wolf , Butcher ghoul.

Combines with
-Culling Dais: easy trigger of undying + card draw

-Deadly Allure: cheap way to force blocks on deathtouch + flashback!

-Tragic Slip: instant creature removal.

-Hunger of the Howlpack: block for trigger, and setup a 5/5 creature. Works wonders with Demonic Taskmaster, guarantees death trigger.

-Demonic Taskmaster: Wincondition. Strong 3 drop that requires some way to keep board in your advantage. Use undying creatures to make board control even stronger on your side.

-Evolution Charm makes your undying creatures even more sticky, or use it to give evasion to a pumped up creature by Hunger.

-Hindervines works well with counter generation of undying.

-Reclamation sage makes for some much needed artifact/enchantment removal.

-Tenacious Dead: Pay 2 mana each upkeep to feed Demonic Taskmaster. Triggers Blood Artist. Makes abilities of Bloodthrone Vampire and Viscera Seer even more potent if mana is overflowing.

Demonlord of Ashmouth: Wincondition. Triggers undying. Need to sacrifice another creature when it dies and comes back by undying though.