Cast Appa either from your hand or from the command zone by paying 2 plus commander tax, if applicable.
When Appa enters, its first ability triggers, exiling Restoration Angel with the ability to cast it later from exile.
Cast Restoration Angel from exile by paying 1 and tapping Appa.
Appa's second ability triggers, creating a 1/1 Ally creature token.
When Restoration Angel enters, it triggers, blinking Appa.
When Appa enters, its first ability triggers, exiling Restoration Angel with the ability to cast it later from exile.
Cast Restoration Angel from exile by paying 0 and tapping Appa and the Ally token.
Repeat from step 4.
This clever loop relies on Dazzling Theater // Prop Room providing the crucial convoke static ability that lets your creatures help pay to recast spells, transforming Appa, Steadfast Guardian into a self-sustaining blink engine. When Appa enters the battlefield, its airbend ability exiles Restoration Angel so it can be recast later for a reduced cost of {2}. Thanks to the theater's prop room half, you can tap Appa and your tokens to cast Restoration Angel, which in turn triggers Appa's second ability to continuously spawn 1/1 Ally tokens. Every time Restoration Angel returns to the battlefield, its own entry trigger blinks Appa right back out to exile the Angel once more, feeding an infinite cycle of enters-the-battlefield effects, storm count, and token generation.