Pact of the Titan is a rare Instant card from Time Spiral Remastered (TSR), collector number 179. Current market price: $0.36 (foil $0.47), TCGplayer market prices via Scryfall.
Create a 4/4 red Giant creature token. At the beginning of your next upkeep, pay {4}{R}. If you don't, you lose the game.