Cast Appa, Steadfast Guardian by paying {W}{W}.
When Appa enters, it triggers, airbending Appa, Loyal Sky Bison.
Cast Appa, Loyal Sky Bison from exile by paying {0} due to Aang.
Appa, Steadfast Guardian triggers, creating a 1/1 Ally creature token.
When Appa, Loyal Sky Bison enters, it triggers, airbending Appa, Steadfast Guardian.
Cast Appa, Steadfast Guardian 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

Appa, Loyal Sky Bison

Cast Appa, Steadfast Guardian by paying {W}{W}.
When Appa enters, it triggers, airbending Appa, Loyal Sky Bison.
Cast Appa, Loyal Sky Bison from exile by paying {0}.
Appa, Steadfast Guardian triggers, creating a 1/1 Ally creature token.
When Appa, Loyal Sky Bison enters, it triggers, airbending Appa, Steadfast Guardian.
Cast Appa, Steadfast Guardian 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

Aang, Swift Savior // Aang and La, Ocean's Fury

Declare Appa as an attacker, triggering its ability, airbending All-Out Assault.
Move to your postcombat main phase, and activate any number of creatures by tapping them, adding at least {2}.
Cast All-Out Assault from exile by paying {2}.
When All-Out Assault enters, it triggers, causing you to get an additional combat and main phase after this one.
Move to your next combat phase. At the beginning of that phase, All-Out Assault triggers, untapping each creature you control.
Repeat.

Infinite combat phases

Infinite mana creatures you control can produce

Infinite untap of creatures you control

All-Out Assault

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 Appa by paying its mana cost.
When Appa 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 Appa
Repeat from step 3.

Infinite artifact ETB

Infinite artifact LTB

Commander Liara Portyr

Restoration Angel

Cast Appa by paying its mana cost.
When Appa 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 "Appa, Loyal Sky Bison"