Cast Appa by paying {W}{W}.
When Appa enters, it triggers, airbending Aang, Swift Savior.
Cast Aang, Swift Savior from exile by paying {0} due to Aang, Master of Elements.
Appa triggers, creating a 1/1 Ally creature token.
When Aang, Swift Savior 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, Swift Savior // Aang and La, Ocean's Fury

Cast Appa by paying {W}{W}.
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 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.
Repeat from step 2.

Doc Aurlock, Grizzled Genius

Cast Aang either from your hand or from the command zone by paying {W}{U} plus commander tax if applicable.
Reflections of Littjara triggers, copying Aang.
Resolve the copy of the Aang spell. When it enters, it triggers, airbending the Aang spell still on the stack.
Cast the Aang spell from exile by paying {0}.
Reflections of Littjara triggers, copying Aang.
Resolve the copy of the Aang spell. Put either Aang token into your graveyard due to the legend rule.
When the Aang token from step 5 enters, it triggers, airbending the Aang spell still on the stack.
Repeat from step 4.

Infinite death triggers

Reflections of Littjara

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 Aang, Swift Savior // Aang and La, Ocean's Fury by paying its mana cost.
When Aang, Swift Savior // Aang and La, Ocean's Fury 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, Swift Savior // Aang and La, Ocean's Fury"