Cast Appa by paying {W}{W}.
When Appa enters, it triggers, airbending Aang, the Last Airbender.
Cast Aang, the Last Airbender from exile by paying {0} due to Aang, Master of Elements.
Appa triggers, creating a 1/1 Ally creature token.
When Aang, the Last Airbender enters, it triggers, airbending Appa.
Cast Appa from exile by paying {0}.
Repeat from step 2.

Infinite creature ETB

Infinite creature LTB

Infinite creature tokens

Infinite storm count

Appa, Steadfast Guardian

Avatar Aang // Aang, Master of Elements

Aang, the Last Airbender

Cast Appa either from your hand or from the command zone by paying {W}{W} plus commander tax if applicable.
When Appa enters, it triggers, airbending Aang.
Cast Aang from exile by paying {0}.
Appa triggers, creating a 1/1 Ally creature token.
When Aang enters, it triggers, airbending Appa.
Cast Appa from exile by paying {0}.
Repeat from step 2.

Urza's Incubator

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

Aang, Airbending Master

Cast Aang by paying its mana cost.
When Aang enters, it triggers, airbending Appa.
Cast Appa from exile by paying {0} due to Doc Aurlock.
When Appa enters, it triggers, airbending Aang.
Cast Aang from exile by paying {0} due to Doc Aurlock.
Appa's second ability triggers, creating a 1/1 Ally creature token.
Repeat from step 2.

Doc Aurlock, Grizzled Genius

Declare two creatures as attackers, ensuring to attack two different opponents. Commander Liara Portyr triggers, causing spells you cast from exile this turn to cost {2} less to cast.
Cast Aang by paying its mana cost.
When Aang enters, it triggers, exiling Restoration Angel with the ability to cast it from exile later.
Cast Restoration Angel from exile by paying {0} due to Commander Liara Portyr.
When Restoration Angel enters, it triggers, blinking Aang
Repeat from step 3.

Infinite artifact ETB

Infinite artifact LTB

Commander Liara Portyr

Restoration Angel

Cast Peregrine Drake by paying {4}{U} plus an additional {2} for its offspring cost.
When Peregrine Drake enters the battlefield, it triggers twice. Resolve the first trigger, untapping up to five lands.
Holding priority, activate up to five lands by tapping them, adding at least {4}.
Resolve the second Peregrine Drake trigger, creating a token copy of it that is 1/1.
When the Peregrine Drake token enters the battlefield, it triggers, untapping up to five lands.
Activate up to five lands by tapping them, adding at least {4}.
Cast Aang by paying {3}{W} plus an additional {2} for its offspring cost.
When Aang enters, it triggers twice. Resolve the first trigger, airbending the nontoken Peregrine Drake.
Resolve the second Aang trigger, creating a token copy of it that is 1/1. Put the token into your graveyard due to the legend rule.
The token Aang's enter-the-battlefield ability triggers, airbending Aang.
Cast Peregrine Drake from exile by paying {2} plus an additional {2} for its offspring cost.
Repeat steps 2 through 6 once.
Cast Aang from exile by paying {2} plus an additional {2} for its offspring cost.
Repeat from step 8.

Infinite mana lands you control can produce

Infinite untap of lands you control

Infinitely powerful creature

Zinnia, Valley's Voice

Peregrine Drake

Cast Aang by paying its mana cost.
When Aang enters, it triggers, exiling Charismatic Conqueror.
Cast Charismatic Conqueror from exile by paying {2}.
Charismatic Conqueror's demonstrate ability triggers, causing you and an opponent to copy it.
Resolve the opponent's copy of Charismatic Conqueror, and then resolve your copy of Charismatic Conqueror.
When your Charismatic Conqueror token enters the battlefield,  the opponent's Charismatic Conqueror triggers, causing you to tap your Charismatic Conqueror token.
Resolve the original Charismatic Conqueror spell.
When the nontoken Charismatic Conqueror enters the battlefield, the opponent's Charismatic Conqueror triggers, causing you to not tap the nontoken Charismatic Conqueror, and causing the opponent to create a 1/1 Vampire creature token.
When the opponent's Vampire token enters the battlefield, both Charismatic Conquerors you control trigger, causing you to create at least one 1/1 Vampire creature token.
When your Vampire token enters the battlefield, the opponent's Charismatic Conqueror triggers, causing you to not tap the Vampire token, and causing the opponent to create a 1/1 Vampire creature token.
Repeat from step 9.

Combos with "Aang, the Last Airbender"