Appa, Steadfast Guardian + Sami, Wildcat Captain + Aang, the Last Airbender

Appa, Steadfast Guardian

Sami, Wildcat Captain

Aang, the Last Airbender

How it works

1. Cast Appa by paying .
2. When Appa enters, it triggers, airbending Aang.
3. Cast Aang from exile by paying 0.
4. Appa triggers, creating a 1/1 Ally creature token.
5. When Aang enters, it triggers, airbending Appa.
6. Cast Appa from exile by paying 0.
7. Repeat from step 2.

This clever loop relies entirely on Sami, Wildcat Captain, whose static affinity for artifacts reduces the casting cost of exiled spells down to nothing when enough artifacts are present. With that cost reduction enabled, Appa, Steadfast Guardian and Aang, the Last Airbender can continuously exile one another as they enter the battlefield. Because Appa triggers a creation ability whenever you cast a spell from exile, this endless cycle generates an infinite number of 1/1 white Ally creature tokens while infinitely repeating enters-the-battlefield and leaves-the-battlefield triggers.