You could legally make a Magical Chase accessory, like Sparky's broom, something that you could see being a promo item bitd... and it would just be fan art. You could honestly describe it as "limited edition" and not only would ignorant collectards bid the crap out of it, ones who understand what it actually is would still pay a lot for it. And many would try pairing it with one of their spare copies of Magical Chase and charge no less than double the combined individual "values". Similar to resellers pairing Earthbound with the air freshener.