Cheapest priced copy (Time Spiral Remastered): $0.49 at Card Kingdom, near mint, their price list as of .
Pact of the Titan 
Instant · Rare · Time Spiral Remastered · #179
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.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.49 to $4.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Future Sight | 103 | Rare | $1.49 | $4.99 |
| Time Spiral Remastered | 179 | Rare | $0.49 | $0.79 |
3 rulings from Wizards of the Coast
- 7 June 2013Although originally printed with a characteristic-defining ability that defined its color, this card now has a color indicator. This color indicator can't be affected by text-changing effects (such as the one created by Crystal Spray), although color-changing effects can still overwrite it.
- 19 March 2021If Pact of the Titan is countered, the delayed triggered ability that threatens you with a game loss won't trigger at the beginning of your next upkeep.
- 19 March 2021You have to pay Pact of the Titan's cost during your next upkeep even if the Giant token doesn't survive that long. Okay, you don't have to, but it's a fairly good idea.