Cast Raffine's Guidance from your graveyard by paying {W} due to Pearl-Ear.
Sigil of the Empty Throne triggers, creating a creature token.
Resolve Raffine's Guidance, attaching it to another creature you control.
Activate Phyrexian Altar by sacrificing the creature that has Raffine's Guidance attached, adding {W}.
Repeat.

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Infinite death triggers

Infinite storm count

Raffine's Guidance

Phyrexian Altar

Sigil of the Empty Throne

Pearl-Ear, Imperial Advisor

Cast Faceless One by paying {0} due to Pearl-Ear.
When Faceless One enters the battlefield, Cloudstone Curio triggers, returning Ugin's Mastery from the battlefield to your hand.
Cast Ugin's Mastery by paying {0} due to Pearl-Ear.
When Ugin's Mastery enters the battlefield, Cloudstone Curio triggers, returning Faceless One from the battlefield to your hand.
Repeat.

Cloudstone Curio

Faceless One

Ugin's Mastery

Cast Faceless One by paying {0} due to Pearl-Ear.
When Faceless One enters the battlefield, Cloudstone Curio triggers, returning Case of the Shattered Pact from the battlefield to your hand.
Cast Case of the Shattered Pact by paying {0} due to Pearl-Ear.
When Case of the Shattered Pact enters the battlefield, it and Cloudstone Curio trigger.
Resolve the Case of the Shattered Pact trigger, causing you to search your library for a basic land card and put it into your hand.
Resolve the Cloudstone Curio trigger, returning Faceless One from the battlefield to your hand.
Repeat.

Put all basic lands from your library into your hand

Case of the Shattered Pact

Cast Ugin's Mastery by paying {0} due to Pearl-Ear.
When Ugin's Mastery enters the battlefield, Cloudstone Curio triggers, returning Case of the Shattered Pact from the battlefield to your hand.
Cast Case of the Shattered Pact by paying {0} due to Pearl-Ear.
When Case of the Shattered Pact enters the battlefield, it and Cloudstone Curio trigger.
Resolve the Case of the Shattered Pact trigger, causing you to search your library for a basic land card and put it into your hand.
Resolve the Cloudstone Curio trigger, returning Ugin's Mastery from the battlefield to your hand.
Repeat.

Combos with "Pearl-Ear, Imperial Advisor"