Activate Orthion's second ability by paying {6}{R}{R}{R} and tapping it, creating five token copies of Satyr Hedonist with haste.
Activate a Satyr Hedonist token by paying {R} and sacrificing it, adding {R}{R}{R}.
When the Satyr Hedonist token dies, Orthion triggers, untapping itself.
Repeat from step 2 for each remaining Satyr Hedonist token.
Repeat from step 1.
Once you have infinite mana, you may forego sacrificing the Satyr Hedonist tokens and/or target any other creature.

Infinite copies of creatures you control with haste

Infinite creature tokens with haste

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite red mana

Infinite sacrifice triggers

Orthion, Hero of Lavabrink

Thornbite Staff

Satyr Hedonist

Activate Satyr Hedonist for {R} and by sacrificing it, adding {R}{R}{R}.
Resolve The Cauldron of Eternity's trigger first, putting Satyr Hedonist on the bottom of your library.
Resolve the Verdant Succession trigger, returning Satyr Hedonist to the battlefield.
Repeat.

Verdant Succession

The Cauldron of Eternity

Activate Satyr Hedonist by paying {R} and sacrificing it, adding {R}{R}{R}.
Cast Wild Cantor by paying {R/G}.
Wild Cantor enters the battlefield, triggering Paleoloth, returning Satyr Hedonist from your graveyard to your hand.
Activate Wild Cantor by sacrificing itself, adding {G}.
Cast Satyr Hedonist by paying {1}{G}.
Satyr Hedonist enters the battlefield, triggering Paleoloth, returning Wild Cantor from your graveyard to your hand.
Repeat.

Infinite storm count

Paleoloth

Bloodspore Thrinax

Wild Cantor

Cast Hollow One either from your hand or from your graveyard by paying at most {1}, causing it to enter the battlefield as a copy of Satyr Hedonist due to Infinite Reflection.
Activate Hollow One by paying {R} and sacrificing it, adding {R}{R}{R}.
If you cast Hollow One from your graveyard, Hollow One is not exiled by Abandoned Sarcophagus due to Infinite Reflection removing Hollow One's cycling ability.
Repeat.

Abandoned Sarcophagus

Infinite Reflection

Hollow One

Combos with "Satyr Hedonist"