Wild card

/wˈaɪld kˈɑːd/

/wˈaɪld kˈɑːɹd/

Wild card

a playing card whose value can be determined by the person who holds it

a person or thing with uncertain or uncontrollable qualities or capabilities

Examples

1. - Like do people just call you Wild Card?

2. - For now, can I call you Wild Card?

3. The Broncos and Steelers are facing off in the Wild Card round of the playoffs at Sports Authority field in Denver.

4. Had it gone the other way, the Mariners, not the A's, would've snagged the AL's second Wild Card spot.