Activate Fire Nation Palace by paying {1}{R} and tapping it, giving Hellkite Charger firebending 4 until end of turn.
Declare Hellkite Charger as an attacker, triggering its firebending ability, its regular ability and Avatar Roku.
Resolve the Avatar Roku and firebending triggers, adding ten {R}.
Resolve the second Hellkite Charger trigger, causing you to pay {5}{R}{R} to untap all attacking creatures and to get an additional combat phase after this one.
Repeat from step 2.

Infinite combat phases

Infinite red mana

Infinitely powerful creatures you control until end of turn

Avatar Roku, Firebender

Hellkite Charger

Fire Nation Palace

Activate Fire Nation Palace's second ability by paying {1}{R} and tapping it, giving Hellkite Charger firebending 4 until end of turn.
Declare Hellkite Charger as an attacker, triggering it and its firebending ability twice.
Resolve both Hellkite Charger firebending triggers, adding eight {R}.
Resolve the first Hellkite Charger trigger, choosing not to pay.
Resolve the second Hellkite Charger trigger, causing you to pay {5}{R}{R} to untap all attacking creatures and to get an additional combat phase after this one.
Repeat from step 2.

Isshin, Two Heavens as One

Activate Fire Nation Palace's second ability by paying {1}{R} and tapping it, giving The Incredible Hulk firebending 4 until end of turn.
Declare The Incredible Hulk as an attacker. Its firebending ability triggers, adding {R}{R}{R}{R}.
Holding priority, activate Pyrohemia by paying {R}, dealing 1 damage to each creature and player.
The Incredible Hulk triggers, putting a +1/+1 counter on it, untapping it and giving you an additional combat phase after this one.
Repeat from step 2 each combat phase.

Near-infinite combat phases

Near-infinite damage to all players

Near-infinite +1/+1 counters on a creature

Bruce Banner // The Incredible Hulk

Pyrohemia

Activate Fire Nation Turret by paying {R}, putting a charge counter on it.
Repeat step 1 two additional times.
Activate Resourceful Defense by paying {4}{W}, moving all charge counters from Fire Nation Turret onto Magistrate's Scepter.
Activate Magistrate's Scepter's second ability by tapping it and removing three charge counters from it, causing you to take an extra turn after this one.
Repeat each turn.

Infinite turns

Lock

Magistrate's Scepter

Fire Nation Turret

Resourceful Defense

At the beginning of your combat phase, Fire Nation Turret triggers, giving The Incredible Hulk +2/+0 and firebending 2 until end of turn.
Declare The Incredible Hulk as an attacker. Its firebending ability triggers, adding {R}{R}.
Holding priority, activate Pyrohemia by paying {R}, dealing 1 damage to each creature and player.
The Incredible Hulk triggers, putting a +1/+1 counter on it, untapping it and giving you an additional combat phase after this one.
Repeat each combat phase.

Activate Fire Nation Palace's second ability by paying {1}{R} and tapping it, giving The Incredible Hulk firebending 4 until end of turn.
Declare The Incredible Hulk as an attacker. Its firebending ability triggers, adding {R}{R}{R}{R}.
Holding priority, activate Walking Ballista's first ability by paying {4}, putting a +1/+1 counter on it.
Activate Walking Ballista's second ability by removing a +1/+1 counter from it, dealing 1 damage to The Incredible Hulk.
The Incredible Hulk triggers, putting a +1/+1 counter on it, untapping it and giving you an additional combat phase after this one.
Repeat from step 2 each combat phase.

Infinite +1/+1 counters on a creature

Walking Ballista

Activate Fire Nation Archers by paying {5}, dealing 2 damage to each opponent and creating a 2/2 Soldier creature token.
When the Soldier enters, Mana Echoes triggers.
Holding priority, activate Fire Nation Archers by paying {5}, dealing 2 damage to each opponent and creating a 2/2 Soldier creature token.
When the Soldier enters, Mana Echoes triggers. 
Resolve the Mana Echoes triggers from steps 2 and 4, adding {C}{C} for each Soldier you control.
Activate Fire Nation Archers by paying {5}, dealing 2 damage to each opponent and creating a 2/2 Soldier creature token.
When the Soldier enters, Mana Echoes triggers, adding {C} for each Soldier you control.
Repeat from step 6.

Infinite ETB

Infinite colorless mana

Infinite damage

Infinite creature tokens

Fire Nation Archers

Mana Echoes

Activate Fire Nation Archers by paying {1}, dealing 2 damage to each opponent and creating a 2/2 Soldier creature token.
Activate Ashnod's Altar by sacrificing the Soldier, adding {C}{C}.
Repeat

Infinite LTB

Infinite sacrifice triggers

Infinite death triggers

Agatha of the Vile Cauldron

Ashnod's Altar

Activate Trazyn using Fire Nation Turret's ability by paying {R}, putting a charge counter on Trazyn.
Repeat step 1 two additional times.
Activate Trazyn using Magistrate's Scepter's second ability by tapping it and removing three charge counters from it, causing you to take an extra turn after this one.
Repeat each turn.

Trazyn the Infinite

Activate Fire Nation Archers by paying {5}, dealing 2 damage to each opponent and creating three 2/2 Soldier creature tokens.
Activate Ashnod's Altar three times by sacrificing three Soldiers, adding six {C}.
Repeat

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