Well, this was a funny little mix-up.
According to @oconnorkyle of Five Wide Sports, Theo Riddick was recently asked to do a trading card signing for Press Pass Sports. This is extremely common, as Riddick recently moved on from Notre Dame and is currently preparing for the NFL Draft in April.
However, it appears that Riddick's card had a picture of teammate KeiVarae Russell, a freshman cornerback instead.
To the right is a picture of the card courtesy of Zeke Motta, who is also preparing for the NFL Draft.
If they're just throwing whoever on these cards, I'm totally willing to start signing some autographs.