Appa, Steadfast Guardian + Will, Scion of Peace + Felidar Guardian

Appa, Steadfast Guardian

Will, Scion of Peace

Felidar Guardian

How it works

1. Activate Will by tapping it, causing white and blue spells you cast to cost 1 less for each life you've gained this turn.
2. Cast Appa by paying
3. When Appa enters, its first ability triggers, exiling Felidar Guardian with the ability to cast it later from exile.
4. Cast Felidar Guardian from exile by paying 0.
5. Appa's second ability triggers, creating a 1/1 Ally creature token.
6. When Felidar Guardian enters, it triggers, blinking Appa.
7. Repeat from step 3.