Activate Cabal Initiate by discarding a card, ensuring to discard Dread if it's in your hand.
Feast of Sanity triggers, and Dread triggers if it was discarded.
Resolve the Dread trigger, shuffling it from your graveyard into your library.
Resolve the Feast of Sanity trigger, dealing 1 damage to any target and causing you to gain 1 life.
Lich's Mastery triggers, causing you to draw one card.
Resolve the Cabal Initiate ability, causing it to gain lifelink until end of turn.
Repeat.

Infinite damage

Infinite draw triggers

Infinite lifegain

Infinite lifegain triggers

Infinite rummaging

Infinite self-discard triggers

Lich's Mastery

Feast of Sanity

Dread

Cabal Initiate

Activate Phyrexian Altar by sacrificing Dread, adding one mana of any color.
Dread and Verdant Succession trigger.
Resolve the Dread trigger, shuffling it into your library.
Resolve the Verdant Succession trigger, searching your library for Dread, putting it onto the battlefield and shuffling your library.
Repeat.

Infinite colored mana

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Verdant Succession

Phyrexian Altar

Painter's Servant

Activate Ashnod's Altar by sacrificing Dread, adding {C}{C}.
Dread and Verdant Succession trigger.
Resolve the Dread trigger, shuffling it into your library.
Resolve the Verdant Succession trigger, searching your library for Dread, putting it onto the battlefield and shuffling your library.
Repeat.

Infinite colorless mana

Ashnod's Altar

Activate Altar of Dementia by sacrificing Dread.
Dread and Verdant Succession trigger.
Resolve the Dread trigger, shuffling it into your library.
Resolve the Verdant Succession trigger, searching your library for Dread, putting it onto the battlefield and shuffling your library.
Resolve the Altar of Dementia ability from step 1, causing target player to mill cards equal to Dread's power.
Repeat.

Infinite mill

Infinite self-mill

Altar of Dementia

Activate Lagomos by tapping it, searching your library for Dread and putting it into your hand.
Activate Mind over Matter by discarding Dread, targeting Lagomos.
Dread triggers, shuflling it from your graveyard into your library.
Resolve the Mind over Matter trigger, untapping Lagomos.
Repeat.

Lagomos, Hand of Hatred

Mind Over Matter

Cause a creature to enter the battlefield under your control by any method.
When that creature enters the battlefield, Reaper King triggers, destroying that creature.
Resolve Atla Palani's trigger, revealing cards from the top of your library until you reveal a creature card and putting it onto the battlefield.
Repeat from step 2 until Dread enters the battlefield then dies, or until you choose to end the loop by destroying an opponent's permanent.
When Dread dies, it and Atla Palani trigger.
Resolve Dread's trigger, shuffling it into your library.
Continue from step 3.

Put all creature cards in your library onto the battlefield, then into your graveyard

Reaper King

Atla Palani, Nest Tender

Maskwood Nexus

Combos with "Dread"