Aang, Airbending Master + Aang, the Last Airbender + Urza's Incubator

Aang, Airbending Master

Aang, the Last Airbender

Urza's Incubator

How it works

1. Cast Aang, Airbending Master either from your hand or from the command zone by paying 2 plus commander tax if applicable.
2. When Aang, Airbending Master enters, it triggers, airbending Aang, the Last Airbender
3. Cast Aang, the Last Airbender from exile by paying 0.
4. When Aang, the Last Airbender enters, it triggers, airbending Aang, Airbending Master.
5. Cast Aang, Airbending Master from exile by paying 0.
6. Repeat from step 2.

This clever loop turns the Avatar's incarnations into a perpetual motion machine by leveraging Urza's Incubator, with its creature-type cost reduction set to Avatar, to completely eliminate the {2} exile-casting cost of your commanders. When you play Aang, Airbending Master, its entrance triggers to exile Aang, the Last Airbender, which can immediately be cast for free back into play. That new entrance then triggers in turn to exile Aang, Airbending Master, allowing you to alternate them back and forth indefinitely. Because each exile and re-entry counts as leaving and entering the battlefield, this cyclical dance generates infinite creature ETBs, infinite LTBs, and an arbitrarily large storm count to seal your victory.