Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Grim Poppet + Ravenous Intruder

Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight

Grim Poppet

Ravenous Intruder

How it works

1. If Grim Poppet has any -1/-1 counters on it, activate it by removing a -1/-1 counter from it.
2. Repeat step 1 as necessary until Grim Poppet has no -1/-1 counters on it.
3. Activate Ravenous Intruder by sacrificing Grim Poppet.
4. When Grim Poppet dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
5. Resolve the Ravenous Intruder ability.
6. Repeat.
7. Resolve all Grim Poppet abilities, putting infinite -1/-1 counters on any number of creatures.

This loop relies on Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight providing a steady engine by granting persist to your other nontoken creatures once transformed, which allows Grim Poppet to keep coming back every time it dies. To trigger that death, you feed Grim Poppet to Ravenous Intruder, which hungrily converts the sacrifice into an infinitely large body while sending the Poppet back to the battlefield with a fresh -1/-1 counter. That very counter—along with any others it enters with—fuels Grim Poppet's activated ability to strip away -1/-1 counters and pepper opposing creatures until the board is completely clear.