Activate Altar of Dementia by sacrificing Elvish Soultiller.
Elvish Soultiller dies, triggering itself and Verdant Succession.
Resolve the Elvish Soultiller trigger, shuffling all Elves or Mutants from your graveyard into your library.
Resolve the Verdant Succession trigger, searching your library for Elvish Soultiller, putting it onto the battlefield and shuffling your library.
Resolve the Altar of Dementia ability, causing target player to mill cards equal to Elvish Soultiller's power.
Repeat.

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite mill

Infinite sacrifice triggers

Infinite self-mill

Verdant Succession

Elvish Soultiller

Altar of Dementia

Activate Ashnod's Altar by sacrificing Elvish Soultiller, adding {C}{C}.
Elvish Soultiller dies, triggering itself and Verdant Succession.
Resolve the Elvish Soultiller trigger, shuffling all Elves or Mutants from your graveyard into your library.
Resolve the Verdant Succession trigger, searching your library for Elvish Soultiller, putting it onto the battlefield and shuffling your library.
Repeat.

Infinite colorless mana

Ashnod's Altar

Activate Phyrexian Altar by sacrificing Elvish Soultiller, adding one mana of any color.
Elvish Soultiller dies, triggering itself and Verdant Succession.
Resolve the Elvish Soultiller trigger, shuffling all Elves or Mutants from your graveyard into your library.
Resolve the Verdant Succession trigger, searching your library for Elvish Soultiller, putting it onto the battlefield and shuffling your library.
Repeat.

Infinite colored mana

Phyrexian Altar

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