Temporal Mastery is a mythic Sorcery card from The List (PLST), collector number MM3-54. Current market price: $4.49, TCGplayer market prices via Scryfall.
Take an extra turn after this one. Exile Temporal Mastery. Miracle {1}{U} (You may cast this card for its miracle cost when you draw it if it's the first card you drew this turn.)