I write the captains' numbers on my hand, and also put on my hand the head coaches names and the setters until I have the rotations memorized. But unless you look at my hand directly, nobody will see it. If you think you have to use a card for this stuff, get a washable marker, and use the writing pad you were born with.

It looks better than using a card, and nobody knows you are using it.

I used to write everything on my hand in the Army. It was a lot easier to clean off(get rid of) when I needed to and a LOT harder to lose when I needed it.

Is this high five given after everyone associated with the opposing team has left, or is it given in view of the opposing players, coaches, and fans? If anyone associated with the opposing team witnesses it, I think this would raise just as many questions about perceived impartiality as a captain asking me, "Travis, what was that call?"