Sphinx's Tutelage is a uncommon Enchantment card from Magic Origins (ORI), collector number 76. Current market price: $2.20 (foil $5.37), TCGplayer market prices via Scryfall.
Whenever you draw a card, target opponent mills two cards. If two nonland cards that share a color were milled this way, repeat this process. {5}{U}: Draw a card, then discard a card.