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.

Infinite creature LTB

Infinite creature ETB

Infinite storm count

Infinite creature tokens

Appa, Steadfast Guardian

Urza's Incubator

Aang, Airbending Master

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, the Last Airbender

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.

Infinite experience counters

Infinite creature tokens at the beginning of your next upkeep

Doc Aurlock, Grizzled Genius

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, Airbending Master"