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 Viscera Seer 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 Viscera Seer ability.
Repeat from step 3.
This gruesome loop turns Traveling Plague's recursion into a perpetual motion machine by leveraging Ghostly Dancers and Viscera Seer. Every time you feed the creature enchanted by Traveling Plague to Viscera Seer's sacrifice ability, the Aura triggers its own return from the graveyard, attaching itself right back to the 3/1 white Spirit token you just created. That new entry triggers Ghostly Dancers's eerie ability to continuously churn out fresh Spirit tokens to feed back into the grinder, giving you an endless engine of sacrifices, graveyard triggers, and scries.