Traveling Plague + Ajani's Chosen + Yahenni, Undying Partisan

Traveling Plague

Ajani's Chosen

Yahenni, Undying Partisan

How it works

1. Cast Traveling Plague by paying 3, attaching it to another creature you control.
2. When Traveling Plague enters, Ajani's Chosen triggers, creating a creature token.
3. Activate Yahenni by sacrificing the creature Traveling Plague is attached to.
4. When the creature dies, Traveling Plague triggers, returning itself from your graveyard to the battlefield attached to the token created in step 2.
5. When Traveling Plague enters, Ajani's Chosen triggers, creating a creature token.
6. Resolve the Yahenni ability.
7. Repeat from step 3.

This clever loop turns Traveling Plague into a perpetual motion machine by exploiting its built-in return trigger whenever its host leaves the battlefield. By using Yahenni, Undying Partisan to continually sacrifice the creature bearing the Curse, you send the Aura to the graveyard only to have it immediately bounce back to the battlefield. Ajani's Chosen ties the whole engine together, generating a fresh Cat token with each recursion so that Traveling Plague always has a new target to attach to, fueling an endless cascade of sacrifices and entries.