Certainly not. Let's remove it.
It hard to imagine someone adding this tag to favorite or ignored tag. It's not useful for search.
It's a meta-tag. It has unclear and potentially very vast area of usage. What questions exactly should be tagged (trick)? Who should tag it — e.g. if an answer is 'trick' should the question be tagged (trick)? (If it's intended for question asking explanations of some 'tricks' then it seems to me there are more or less reasonable tags for this already.)
The proposed tag doesn't fit well into current tagging ideology of SE and it's (intended) usage is not at all clear. Of course, rules can have exceptions — but if someone wants an exception to be made they should make a coherent proposal with some arguments addressing the issues (no, 'why not' and 'there are a lot of highly voted questions that involve tricks' is not remotely enough).