Negative "X" Token

Teachers, in my class, I create teams of students and reward them with tokens to put in their team clear plastic container.This token adds some mischief into the mix by allowing a student to pick an opposing team to “subtract” a point from their team by adding this X token into their container. Allow them to save up for the semester or whole school year to be the winning team!This is a simple 2 color model with only 1 color change to reduce waste, minimize cost, and maximize efficiency.I also ha