Agrus Kos triggers, causing you to pay ({1} magic symbol) ({RW} magic symbol) to copy Soulbright Flamekin's ability, targeting every other creature you control.
Resolve all Soulbright Flamekin abilities, adding eight ({R} magic symbol) and giving creatures you control trample until end of turn.
Activate Jaxis by paying ({R} magic symbol) , tapping it and discarding a card, targeting Agrus Kos.
Agrus Kos triggers, causing you to pay ({1} magic symbol) ({RW} magic symbol) to copy Jaxis' ability, targeting every other creature you control.
Resolve all Jaxis abilities, creating a token that's a copy of each other creature you control with haste.
Put the token Agrus Kos into your graveyard due to the legend rule.
The Agrus Kos and Sky Hussar tokens trigger.
Resolve the Agrus Kos trigger, causing you to draw a card.
Resolve the Sky Hussar trigger, untapping all creatures you control.
Repeat, using the Soulbright Flamekin token instead.
Results
Infinite self-discard triggers.
Near-infinite ETB.
Infinite draw triggers.
Near-infinite LTB.
Infinite rummaging.
Near-infinite death triggers.
Near-infinite sacrifice triggers.
Near-infinite creature tokens with haste.
Near-infinite red mana.
Near-infinite untap of creatures you control.
Near-infinite mana creatures you control can produce.