Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Bartolomé del Presidio + Gleeful Arsonist

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

Bartolomé del Presidio

Gleeful Arsonist

How it works

1. Activate Bartolomé del Presidio by sacrificing Gleeful Arsonist
2. When Gleeful Arsonist dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
3. Activate Bartolomé del Presidio by sacrificing Gleeful Arsonist
4. When Gleeful Arsonist dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
5. Resolve both Bartolomé del Presidio abilities from step 1 and 3.
6. Repeat.

This loop relies on the constant shifting of counters to perpetually recycle Gleeful Arsonist through the graveyard using Bartolomé del Presidio's sacrifice ability. While Bartolomé grows infinitely large with each sacrifice, the back-and-forth between undying and persist is safely enabled by Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight granting its second-face persist ability to keep the cycle going.