can somebody explain to me what the "wildcard" thing is iv'e hard about it and i am really confused on it
Wildcards basically let you bend the rules a bit.
For example, there is a Wildcard ...

The guy recorded someone else's gameplay, and pretty badly at that.

Besides, the person in the original video was playing COMBAT TRAINING.

Actually, the characters in Grief mode (4z4) are CDC vs. CIA.

you still get the token as long as you are 1st prestige or higherso a token for every prestige?
No, just one token per game.

What if when you go to attach the xp time on an account to a gamer tag it takes away that xp from the other people?

How exactly can they be used twice?

This is legit dudes.