Activate Harnfel by discarding a card.
Necropotence and Feast of Sanity trigger.
Resolve the Feast of Sanity trigger, dealing 1 damage to any target and causing you to gain 1 life.
Resolve the Necropotence trigger, exiling the discarded card from your graveyard.
Ketramose triggers, causing you to draw a card and lose 1 life.
Repeat.
Resolve all Harnfel abilities.

Near-infinite damage

Infinite self-discard triggers

Near-infinite lifegain triggers

Infinite draw triggers

Exile your library

Infinite rummaging

Ketramose, the New Dawn

Necropotence

Feast of Sanity

Birgi, God of Storytelling // Harnfel, Horn of Bounty

Activate Harnfel by discarding a card.
Necropotence triggers, exiling the discarded card from your graveyard.
Ketramose triggers, causing you to draw a card and lose 1 life.
Starving Revenant triggers, causing you to gain 1 life and target opponent to lose 1 life.
Repeat.
Resolve all Harnfel abilities.

Near-infinite lifeloss

Starving Revenant

Activate Birgi, God of Storytelling // Harnfel, Horn of Bounty by discarding a card.
Containment Construct triggers, exiling the discarded card with the ability to play it until end of turn.
Ketramose triggers, causing you to draw a card and lose 1 life.
Starving Revenant triggers, causing you to gain 1 life and an opponent to lose 1 life.
Resolve the Birgi, God of Storytelling // Harnfel, Horn of Bounty ability.
Repeat.

Exile your library with the ability to play the exiled cards until end of turn

Containment Construct

Activate Horn of Ramos by sacrificing it, adding {G}.
Activate Arcbound Reclaimer by removing a +1/+1 counter from it, putting Horn of Ramos from your graveyard onto the top of your library.
Activate Oracle's Vault's second ability by tapping it, exiling Horn of Ramos from the top of your library with the ability to play it until end of turn without playing its mana cost.
Cast Horn of Ramos from exile without paying its mana cost.
Rocco's second ability triggers, putting a +1/+1 counter on Arcbound Reclaimer and creating a Food token.
Activate Clock of Omens by tapping the Food and Horn of Ramos, untapping Oracle's Vault.
Repeat.

Infinite LTB

Infinite ETB

Infinite sacrifice triggers

Infinite death triggers

Infinite storm count

Infinite green mana

Infinite tapped Food tokens

Rocco, Street Chef

Oracle's Vault

Arcbound Reclaimer

Clock of Omens

Horn of Ramos

Activate Harnfel by discarding a card.
Toluz's second ability and Feast of Sanity trigger.
Resolve the Feast of Sanity trigger, dealing 1 damage to any target and causing you to gain 1 life.
Resolve the Toluz trigger, exiling the discarded card from your graveyard.
Ketramose triggers, causing you to draw a card and lose 1 life.
Repeat.
Resolve all Harnfel abilities.

Toluz, Clever Conductor

Activate Harnfel by discarding a card.
Toluz's second ability triggers, exiling the discarded card from your graveyard.
Ketramose triggers, causing you to draw a card and lose 1 life.
Starving Revenant triggers, causing you to gain 1 life and target opponent to lose 1 life.
Repeat.
Resolve all Harnfel abilities.

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