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 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.

10/10

Alexandre Honoré

Legalities

NOT LEGALStandard
NOT LEGALPioneer
NOT LEGALModern
NOT LEGALLegacy
NOT LEGALVintage
NOT LEGALCommander
NOT LEGALOathbreaker
NOT LEGALAlchemy
NOT LEGALHistoric
NOT LEGALBrawl
NOT LEGALTimeless
NOT LEGALPauper
NOT LEGALPenny