Cast Traveling Plague by paying 3, attaching it to another creature you control.
When Traveling Plague enters, Ghostly Dancers triggers, creating a creature token.
Activate Umbral Collar Zealot by sacrificing the creature Traveling Plague is attached to.
When the creature dies, Traveling Plague triggers, returning itself from your graveyard to the battlefield attached to the token created in step 2.
When Traveling Plague enters, Ghostly Dancers triggers, creating a creature token.
Resolve the Umbral Collar Zealot ability.
Repeat from step 3.
This loop transforms the recursive persistence of Traveling Plague into a relentless engine fueled by your own graveyard. By enchanting a disposable creature, you can use Umbral Collar Zealot to sacrifice it, sending the creature to the graveyard and instantly triggering Traveling Plague to return itself directly to the battlefield. Because Ghostly Dancers is watching your enchantments enter, every single recursion of the Plague generates a fresh 3/1 white Spirit token, which immediately becomes the new home for the Aura's next deployment.