A big problem with Tinker as a "fair" card is that it's pretty difficult to find cards that feel "fair" while cheated out while still being worth playing when not cheated. I'm not sure to what extent this can be realistically designed around. I would imagine a high-density of artifacts in the environment, with Tinker serving as a minor-accelerant + tutor as the best home for it, but that probably doesn't describe the natural state of most of our environments.