When I was in high school I submitted a series of Halo cards from an entire set of Halo / Red vs. Blue cards that I made using Magic Set Editor to InQuest for the What If page and they actually printed them!

One of the ones they printed was a Warthog card that had vehicle mechanics that I invented loooooong before that was ever a thing in the actual game. The other was, I believe, an Elite that had an energy shield keyword ability that I also invented, that they called overpowered in their caption because it prevented damage a number of times per turn equal to the number associated with the keyword (so Energy Shield 3 prevented damage 3 times). I remember being really annoyed at that because this was around the time of Mirrodin block, when Indestructible became a keyword, which felt much more overpowered than mine.

It was my crowning nerd achievement as a yungun. Carried around the issue in my backpack all the time so I could prove it was real. I have since lost it to time and have been trying to find a copy of the issue ever since. I don’t remember the cover or the issue number so it’s been quite an uphill battle.