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I see that there are some cards that have tags for various things such as how they are wearing socks or other weird things like that. I haven't seen a tag like this but there is a certain sub-collection of mine that is in regards to video game related things that are not necessarily video game related cards.

I was wondering if it would be possible to tag cards like this but do not know if it is allowed, or what the tag should be called if it were.

The examples I have of these cards in my collection are like so.

The Signature Moves subset in 1997-98 Score hockey
https://www.tcdb.com/ViewCard.cfm/sid/5460/cid/1164539/1997-98-Score-264-Sergei-Fedorov

Sid Meier card from 2015 Goodwin Champions
https://www.tcdb.com/ViewCard.cfm/sid/115297/cid/10560779/2015-Upper-Deck-Goodwin-Champions---Memorabilia-M-SM-Sid-Meier

Nintendo NES from 2011 Topps American Pie
https://www.tcdb.com/ViewCard.cfm/sid/75065/cid/5311847/2011-Topps-American-Pie-152-Nintendo's-NES-released

And Mike Komisarek from 2008-09 Upper Deck hockey where it shows the Playstation logo on the boards
https://www.tcdb.com/ViewCard.cfm/sid/8985/cid/1239122/2008-09-Upper-Deck-97-Mike-Komisarek

I have more examples but they are in another binder. The only other thing I can think of is to make a List for cards like this.

I think a List would serve you better.  And other members are always on the look out for cards that fit member's lists.  Look at some of the larger, more popular lists; lots of cards (finds) are from members. 
For example: https://www.tcdb.com/List.cfm/lid/6868/Didn't-Expect-to-See-That-!?C=64

A negative for using Tags: ANY member can tag a card with ANY tag they feel like.  If you look at some of the Tagged lists you'll see cards that have nothing to do with the tag.  So, if there were a "Video Games" tag, it could quickly fill with cards that have nothing to do with video games.  Here's one example of what I mean, Interesting Background. Looking through you'll find yourself asking, "Why is this tagged? What is so interesting about the background?".

I've got to agree with Chuck here (C2C). His example is a good explanation of how some people use TAGS without actually considering what they are tagging. A large portion of those cards only have an "Interesting Background" to certain people. Most of them should NOT be tagged like that.

Making a User List is a much better idea and it will personally serve you better than tagging the cards as such.