Activate Chthonian Nightmare by paying {E}{E}{E}, sacrificing Patron of the Arts and returning Chthonian Nightmare from the battlefield to your hand.
When Patron of the Arts dies, it triggers, creating a Treasure token.
Resolve the Chthonian Nightmare ability, returning Flamecache Gecko from your graveyard to the battlefield.
When Flamecache Gecko enters the battlefield, it triggers, adding {B}{R}.
Activate the Treasure by tapping and sacrificing it, adding {1}.
Cast Chthonian Nightmare by paying {1}{B}.
When Chthonian Nightmare enters the battlefield, it triggers, causing you to get {E}{E}{E}.
Activate Chthonian Nightmare by paying {E}{E}{E}, sacrificing Flamecache Gecko and returning Chthonian Nightmare from the battlefield to your hand, returning Patron of the Arts from your graveyard to the battlefield.
When Patron of the Arts enters the battlefield, it triggers, creating a Treasure token.
Activate the Treasure by tapping and sacrificing it, adding {B}.
Cast Chthonian Nightmare by paying {1}{B}.
When Chthonian Nightmare enters the battlefield, it triggers, causing you to get {E}{E}{E}.
Repeat.

Infinite LTB

Infinite ETB

Infinite sacrifice triggers

Infinite death triggers

Infinite storm count

Chthonian Nightmare

Patron of the Arts

Flamecache Gecko

Cast Chthonian Nightmare by paying {1}{B}.
When Chthonian Nightmare enters the battlefield, it triggers, causing you to get {E}{E}{E}.
Activate Chthonian Nightmare by paying {E}{E}{E}, sacrificing Flamecache Gecko and returning Chthonian Nightmare from the battlefield to your hand, returning Activated Sleeper from your graveyard to the battlefield as a copy of Flamecache Gecko.
When Activated Sleeper enters the battlefield, it triggers, adding {B}{R}.
Cast Chthonian Nightmare by paying {1}{B}.
When Chthonian Nightmare enters the battlefield, it triggers, causing you to get {E}{E}{E}.
Activate Chthonian Nightmare by paying {E}{E}, sacrificing Activated Sleeper and returning Chthonian Nightmare from the battlefield to your hand, returning Flamecache Gecko from your graveyard to the battlefield.
When Flamecache Gecko enters the battlefield, it triggers, adding {B}{R}.
Repeat.

Infinite self-discard triggers

Infinite draw triggers

Infinite rummaging

Infinite energy counters

Activated Sleeper

Activate Jaxis by paying {R}, tapping it and discarding a card, creating a token copy of Flamecache Gecko with haste.
When Flamecache Gecko enters the battlefield, it triggers, adding {B}{R}.
Activate Ashnod's Altar by sacrificing the Flamecache Gecko token, adding {C}{C}.
When the Flamecache Gecko token dies, it triggers, causing you to draw a card.
Activate Sword of the Paruns by paying {3}, untapping Jaxis.
Repeat.

Near-infinite ETB

Near-infinite LTB

Near-infinite death triggers

Near-infinite sacrifice triggers

Near-infinite black mana

Jaxis, the Troublemaker

Ashnod's Altar

Sword of the Paruns

Cast Flamecache Gecko by paying {1}{R}.
When Flamecache Gecko enters the battlefield, it and Intruder Alarm trigger.
Resolve the Flamecache Gecko trigger, adding {B}{R}.
Resolve the Intruder Alarm trigger, untapping all creatures.
Activate Tradewind Rider by tapping it, Flamecache Gecko and one other creature you control, returning Flamecache Gecko from the battlefield to your hand.
Repeat.

Infinite red mana

Infinite untap of creatures you control

Infinite mana creatures you control can produce

Infinite black mana

Tradewind Rider

Intruder Alarm

Activate Midnight Guard using The Jolly Balloon Man's ability by paying {1} and tapping it, creating a token copy of Flamecache Gecko that is a 1/1 Balloon with flying and haste in addition to its other types.
When the Flamecache Gecko token enters the battlefield, it and Midnight Guard trigger.
Resolve the Flamecache Gecko token's trigger, adding {B}{R}.
Resolve the Midnight Guard trigger, untapping it.
Repeat.

Infinite creature tokens with haste

Infinite token copies of each creature you control with haste except Midnight Guard

The Jolly Balloon Man

Agatha's Soul Cauldron

Midnight Guard

Combos with "Flamecache Gecko"