Appa, Steadfast Guardian + Restoration Angel + Cloud Key + Gathering Stone

Appa, Steadfast Guardian

Restoration Angel

Cloud Key

Gathering Stone

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