Appa, Steadfast Guardian + Umori, the Collector + Icewind Stalwart + Stormscape Familiar

Appa, Steadfast Guardian

Umori, the Collector

Icewind Stalwart

Stormscape Familiar

How it works

1. Cast Appa by paying
2. When Appa enters, its first ability triggers, exiling Icewind Stalwart with the ability to cast it later from exile.
3. Cast Icewind Stalwart from exile by paying 0.
4. Appa's second ability triggers, creating a 1/1 Ally creature token
5. When Icewind Stalwart enters, it triggers, blinking Appa.
6. Repeat from step 2.