The Ur-Sphinx Price and Data

The Ur-Sphinx Card Text

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.

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Source

Scryfall card record. Preview prices may change before release.