Appa, Steadfast Guardian + Umori, the Collector + Felidar Guardian + Honest Rutstein

Appa, Steadfast Guardian

Umori, the Collector

Felidar Guardian

Honest Rutstein

How it works

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