Wiktionary
chance card
n. A card, in any of various games, with instructions to be followed by a player whose token lands on a "chance" space, usually affording them some chance opportunity or inflicting upon them some chance misfortune.
Usage examples of "chance card".
He had to guess the celebrity's price within fifty dollars to get his fifth Big Chance card, which he needed to enter the Final Spin to get into the Final Round, where he might win a Jeep.