Which one is it?
Win by walking away
Pick the winning card out of two. Skill plays no part whatsoever. It is entirely luck.
Every hit stretches the odds you have beaten so far: 1/2, 1/4, 1/8, 1/16. Ten in a row is 1/1,024.
One miss takes all of it. You can stop at any point and keep the record. The whole game is deciding when to stop.
One run as your daily fortune
One run, and see how far the streak goes. Three in a row means it is a good day. Roughly that level of seriousness.
First to five in a row
Take turns; first to five straight wins. That is 1/32, so it takes longer to settle than you would think.
Shortest streak pays
One run each, and whoever has the shortest streak picks up the bill. Far better than drawing straws.