Since you are making these cards now (though I think it would be a good idea to make a set specifically for them, so it's easier to be aware that they are meant for another game e. g. this), here is something I'm crious about: What's the rhyme and reason to assign cards to classes here?

Making another set might be reasonable. In this case, it's a paladin card because it's a spoof on Galvadon, a paladin card. More generally, I'm not sure; the rules about what classes get what effect aren't as clear cut as the colors of magic.