Appa, Steadfast Guardian + Hoarding Broodlord + Restoration Angel

Appa, Steadfast Guardian

Hoarding Broodlord

Restoration Angel

How it works

1. Cast Appa by paying 2.
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 and tapping Appa and another creature you control.
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.

This clever loop centers around Appa, Steadfast Guardian, whose entry triggers an airbend that exiles Restoration Angel so it can be recast later. By casting Restoration Angel from exile using convoke—which is made possible when you substitute Hoarding Broodlord into the equation to grant that keyword to spells cast from exile—you can tap Appa and another creature to pay the casting cost for {0}. Every time you successfully cast from exile, Appa, Steadfast Guardian rewards you by generating a 1/1 white Ally creature token. Meanwhile, Restoration Angel's entrance triggers a blink of Appa, resetting the entire engine to achieve infinite entry and leave-the-battlefield triggers, an infinite storm count, and an endless army of tapped tokens.