At the beginning of your precombat main phase, There and Back Again triggers, putting a lore counter on it.
There and Back Again's third chapter ability triggers, creating a legendary 6/6 Smaug creature token and causing you to sacrifice There and Back Again.
Activate Esika's Chariot's crew ability by tapping the Smaug token, causing Esika's Chariot to become an artifact creature until end of turn.
Declare Esika's Chariot as an attacker.
Esika's Chariot's second ability triggers, creating a copy of the Smaug token.
Put either Smaug token into your graveyard due to the legend rule.
When the Smaug token dies, it triggers, creating fourteen Treasure tokens.
Move to your postcombat main phase.
Activate five Treasures by tapping and sacrificing them, adding {3}{R}{R}.
Activate Aggravated Assault by paying {3}{R}{R}, causing you to untap all creatures you control and to get an additional combat and main phase after this one.
Repeat from step 4.

Infinite LTB

Infinite ETB

Infinite colored mana

Infinite death triggers

Infinite combat phases

Infinite untap of creatures you control

Infinite mana creatures you control can produce

Infinite Treasure tokens

Infinite copies of tokens you control

Esika's Chariot

There and Back Again

Aggravated Assault

Activate Urza by paying {6}, creating two token copies of Esika's Chariot.
When the Esika's Chariots enter the battlefield, their first abilities trigger, creating eight 2/2 Cat creature tokens.
Activate Ashnod's Altar three times by sacrificing three tokens, adding six {C}.
Repeat.

Infinite sacrifice triggers

Infinite colorless mana

Infinite creature tokens

Infinite creature copies of artifacts you control

Urza, Prince of Kroog

Ashnod's Altar

Adrix and Nev, Twincasters

Activate Cogwork Assembler by paying {7}, creating two token copies of Esika's Chariot.
When the Esika's Chariots enter the battlefield, their first abilities trigger, creating four 2/2 Cat creature tokens.
Activate Ashnod's Altar four times by sacrificing the Cats, adding eight {C}.
Repeat.
Once you have infinite mana, you may forego sacrificing the Cats and/or target any other artifact using Cogwork Assembler.

Infinite copies of artifacts you control

Infinite creature tokens with haste

Cogwork Assembler

Parallel Lives

At the beginning of your precombat main phase, There and Back Again triggers, putting a lore counter on it.
There and Back Again's third chapter ability triggers, creating a legendary 6/6 Smaug creature token and causing you to sacrifice There and Back Again.
Activate Esika's Chariot's crew ability by tapping the Smaug token, causing Esika's Chariot to become an artifact creature until end of turn.
Declare Esika's Chariot and Hellkite Charger as attackers, triggering their abilities.
Resolve the Esika's Chariot's trigger, creating a copy of the Smaug token.
Put either Smaug token into your graveyard due to the legend rule.
When the Smaug token dies, it triggers, creating fourteen Treasure tokens.
Activate seven Treasures by tapping and sacrificing them, adding {5}{R}{R}.
Resolve the 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 4 each combat phase.

Hellkite Charger

At the beginning of your precombat main phase, There and Back Again triggers, putting a lore counter on it.
There and Back Again's third chapter ability triggers, creating a legendary 6/6 Smaug creature token and causing you to sacrifice There and Back Again.
Activate Esika's Chariot's crew ability by tapping the Smaug token, causing Esika's Chariot to become an artifact creature until end of turn.
Declare Esika's Chariot as an attacker.
Esika's Chariot's second ability triggers, creating a copy of the Smaug token.
Put either Smaug token into your graveyard due to the legend rule.
When the Smaug token dies, it triggers, creating fourteen Treasure tokens.
Activate Time Sieve by tapping it and sacrificing five Treasures, causing you to take an extra turn after this one.
Repeat from step 3 each turn.

Infinite turns

Time Sieve

Activate Cogwork Assembler by paying {7}, creating a token copy of Esika's Chariot.
When the Esika's Chariot token enters the battlefield, its first ability triggers twice, creating four 2/2 Cat creature tokens.
Activate Ashnod's Altar four times by sacrificing the Cats, adding eight {C}.
Repeat.

Panharmonicon

At the beginning of your precombat main phase, There and Back Again triggers, putting a lore counter on it.
There and Back Again's third chapter ability triggers, creating a legendary 6/6 Smaug creature token and causing you to sacrifice There and Back Again.
Activate Esika's Chariot's crew ability by tapping the Smaug token, causing Esika's Chariot to become an artifact creature until end of turn.
Declare Esika's Chariot as an attacker.
Esika's Chariot's second ability triggers, creating a copy of the Smaug token.
Put either Smaug token into your graveyard due to the legend rule.
When the Smaug token dies, it triggers, creating fourteen Treasure tokens.
Activate five Treasures by tapping and sacrificing them, adding {W}{U}{B}{R}{G}.
Activate Najeela by paying {W}{U}{B}{R}{G}, untapping all attacking creatures, giving them trample, lifelink and haste, and gaining an additional combat phase after this one.
Repeat from step 4 each combat phase.

Najeela, the Blade-Blossom

Combos with "Esika's Chariot"