The Ur-Sphinx

Legendary Creature — Sphinx Avatar

Eminence — As long as The Ur-Sphinx is in the command zone or on the battlefield, other Sphinx spells you cast cost {1} less to cast.
Flying
Whenever one or more Sphinxes you control attack, each player mills that many cards. For each player, you may cast a card that player milled this way without paying its mana cost.

Illustrated by Alexandre Honoré

Reality Fracture Commander (FRC)

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