Mastermind's Acquisition is a rare Sorcery card from Rivals of Ixalan Promos (PRIX), collector number 77p. Current market price: $4.19 (foil $5.97), TCGplayer market prices via Scryfall.
Choose one — • Search your library for a card, put it into your hand, then shuffle. • Put a card you own from outside the game into your hand.