Appa, Steadfast Guardian + Pearl Medallion + Cloud Key + Icewind Stalwart

Appa, Steadfast Guardian

Pearl Medallion

Cloud Key

Icewind Stalwart

How it works

1. Cast Appa either from your hand or from the command zone by paying plus commander tax, if applicable.
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.