You 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.

If 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.

Although 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.