Activate Phyrexian Altar by sacrificing Protean Raider, adding {B}.
When Protean Raider dies, it triggers, causing you to mill six cards and return Unearth and up to one other instant or sorcery card from your graveyard to your hand.
Cast Unearth by paying {B}, returning Protean Raider from your graveyard to the battlefield as a copy of Kairi.
Repeat.

Infinite creature ETB

Infinite creature LTB

Infinite death triggers

Infinite magecraft triggers

Infinite creature sacrifice triggers

Infinite self-mill

Infinite storm count

Return all instant and sorcery cards from your graveyard to your hand

Kairi, the Swirling Sky

Protean Raider

Phyrexian Altar

Unearth

Council of Reeds

Mirror Gallery

Sakashima of a Thousand Faces

Mirror Box

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