Activate Ashnod's Altar by sacrificing Wilhelt, adding CC.
When Wilhelt dies, Myrkul triggers, exiling Wilhelt from your graveyard and creating a token copy of Wilhelt that is an enchantment.
Cast Humility by paying 2.
Activate Ashnod's Altar by sacrificing a Zombie, CC.
When the Zombie dies, the Wilhelt token triggers, creating a 2/2 Zombie creature token with decayed, which becomes a 1/1 Zombie without decayed due to Humility.