Activate Phyrexian Altar twice by sacrificing Poxwalkers and Eternal Scourge, adding {1}{B/G}.
Activate Lluwen by exiling Eternal Scourge from your graveyard, causing Lluwen to become prepared.
Cast a copy of Pest Friend by paying {B/G}.
Poxwalkers triggers, returning it from your graveyard to the battlefield.
Resolve Pest Friend, creating a 1/1 Pest creature token.
Activate Phyrexian Altar twice by sacrificing Poxwalkers and the Pest, adding {2}.
Cast Eternal Scourge from exile by paying {3}.
Repeat.

Infinite ETB

Infinite LTB

Infinite death triggers

Infinite magecraft triggers

Infinite sacrifice triggers

Infinite storm count

Lluwen, Exchange Student // Pest Friend

Eternal Scourge

Poxwalkers

Phyrexian Altar

Cast a copy of the prepared spell from exile by paying one mana, unpreparing Lluwen, Exchange Student.
When you cast this, Displacer Kitten and Storm-Kiln Artist triggers.
Resolve the Displacer Kitten ability, flickering Lluwen, Exchange Student, which enters prepared.
Resolve the remaining trigger, creating a Treasure token.
Resolve the spell from step 1.
Activate the Treasure token by tapping and sacrificing it, adding one mana.
Repeat.

Infinite creature tokens

Displacer Kitten

Storm-Kiln Artist

Activate Phyrexian Altar by sacrificing Eternal Scourge, adding {B/G}.
When Eternal Scourge dies, Pitiless Plunderer triggers, creating a Treasure token.
Activate Lluwen by exiling Eternal Scourge from your graveyard, causing Lluwen to become prepared.
Cast a copy of Pest Friend by paying {B/G}, creating a 1/1 Pest creature token.
Activate Phyrexian Altar by sacrificing the Pest, adding {1}.
When the Pest dies, Pitiless Plunderer triggers, creating a Treasure token.
Activate two Treasures by tapping and sacrificing them, adding {2}.
Cast Eternal Scourge from exile by paying {3}.
Repeat.

Pitiless Plunderer

Cast a copy of the prepared spell by paying its mana cost.
When you cast that spell, Displacer Kitten and Dovescape trigger.
Resolve the Dovescape trigger, countering the prepared spell and creating a number of 1/1 flying Bird creature tokens equal to its mana value.
Resolve the Displacer Kitten trigger, blinking Lluwen, Exchange Student // Pest Friend, which enters prepared.
Activate Phyrexian Altar by sacrificing a Bird token, adding one mana of any color.
Repeat.

Infinite colored mana

Dovescape

Cast the copy of Pest Friend from exile by paying {B/G}.
When you cast that spell, Displacer Kitten triggers, flickering Lluwen, Exchange Student, which enters prepared.
When Lluwen, Exchange Student enters, Mana Echoes triggers, adding at least {C}.
Resolve the spell from step 1, creating a 1/1 Pest creature token.
When the token enters, Mana Echoes triggers, adding {C} each time for each Pest you control.
Activate Energy Refractor by paying {C}{C}, adding one colored mana.
Repeat.

Combos with "Lluwen, Exchange Student // Pest Friend"