Activate up to five lands by tapping them, adding at least {2}{U}{B}{B}.
Activate Tortured Existence by paying {B} and discarding Peregrine Drake, targeting any other creature card in your graveyard.
Hashaton triggers, causing you to pay {2}{U} to create a token copy of Peregrine Drake that is a 4/4 Zombie.
When the Peregrine Drake token enters the battlefield, it triggers, untapping up to five lands.
Resolve the Tortured Existence ability, returning the targeted creature from your graveyard to your hand.
Activate Tortured Existence by paying {B} and discarding a creature card, targeting Peregrine Drake.
Hashaton triggers. Choose not to pay.
Resolve the Tortured Existence ability, returning Peregrine Drake from your graveyard to your hand.
Repeat.

Infinite creature ETB

Infinite self-discard triggers

Infinite tapped creature tokens

Hashaton, Scarab's Fist

Tortured Existence

Peregrine Drake

Activate Grim Poppet by removing a -1/-1 counter from it, putting a -1/-1 counter on Altered Ego.
Nest of Scarabs triggers, creating a creature token.
Activate Altered Ego by removing a -1/-1 counter from it, putting a -1/-1 counter on Grim Poppet.
Nest of Scarabs triggers, creating a creature token.
Repeat.

Infinite creature tokens

Grim Poppet

Nest of Scarabs

Altered Ego

Attempt to draw a card. 
The draw will be replaced by Chains of Mephistopheles, instead causing you to discard Grave-Shell Scarab. Then, the draw will be replaced by Grave-Shell Scarab's dredge ability, causing you to mill cards and return Grave-Shell Scarab from your graveyard to your hand.
Dredger's Insight's first ability triggers, causing you to gain 1 life.
Lich's Mastery triggers, attempting to draw a card.
Repeat from step 2.

Infinite self-mill

Near-infinite lifegain

Near-infinite lifegain triggers

Near-infinite self-discard triggers

Chains of Mephistopheles

Dredger's Insight

Lich's Mastery

Grave-Shell Scarab

Activate Five Hundred Year Diary by tapping it, adding at least {U}{U}{U}.
Activate Mind Over Matter by discarding Vampire Charmseeker.
Hashaton triggers, causing you to pay {2}{U} to create a tapped token copy of Vampire Charmseeker that is a 4/4 Zombie.
When the Vampire Charmseeker token enters the battlefield, it triggers, returning Vampire Charmseeker from your graveyard to your hand.
Resolve the Mind Over Matter ability, untapping Five Hundred Year Diary.
Repeat.

Infinite blue mana

Mind Over Matter

Vampire Charmseeker

Five Hundred Year Diary

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