Cast Furnace Hellkite by paying {R}{R}.
When Furnace Hellkite enters the battlefield, Ganax and Lathliss trigger.
Resolve the Ganax trigger, creating a Treasure token.
Resolve the Lathliss trigger, creating a 5/5 Dragon creature token.
When the Dragon token enters the battlefield, Cloudstone Curio and Ganax trigger.
Resolve the Cloudstone Curio trigger, returning Furnace Hellkite from the battlefield to your hand.
Resolve the Ganax trigger, creating a Treasure token.
Activate the Treasure tokens by tapping and sacrificing it, adding {R}{R}.
Repeat.

Infinite creature tokens

Infinite ETB

Infinite LTB

Infinite storm count

Ganax, Astral Hunter

Lathliss, Dragon Queen

Cloudstone Curio

Furnace Hellkite

Activate a Treasure by tapping and sacrificing it, adding {2}.
Furnace Celebration triggers, causing you to pay {2} to deal two damage to an opponent.
Malcolm triggers, creating a Treasure token.
Repeat.

Infinite damage

Malcolm, Keen-Eyed Navigator

Furnace Celebration

Opalescence

Goldspan Dragon

Xenograft

Arcane Adaptation

Maskwood Nexus

Declare the creature with Breath of Fury attached and Sun-Blessed Guardian // Furnace-Blessed Conqueror as attackers.
Sun-Blessed Guardian // Furnace-Blessed Conqueror triggers, creating a creature token.
Deal combat damage using the creature that has Breath of Fury attached. 
Breath of Fury triggers, causing you to sacrifice the creature it is attached to, then attach Breath of Fury to the creature token, then causing you to untap all creatures you control and to get an additional combat phase after this one.
Repeat each combat phase.

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