Pacto del titán

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.

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.

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.