The things you find in boxes of misc cards <smh>.
I cannot find this on the database. It should be in Non-Sport - Comics. After a lot of research I found they were inserts in Collector's Sportslook magazine. They were promos for Image comics (not Comic Images cards). Apparently, there were 3 cards. The Savage Dragon boxing, Spawn playing hockey, and Zealot playing soccer.
I will add the set and checklist unless someone else has different or additional information.
Someday my cards may double in value and then be worth half of what I paid for them.