It just exists in one, Blue
Pair Greasefang with Peacewalker Colossus and make your peace by wiping everyone else out
Beyond the basic Arcane Signet and Sol Ring, artifacts that produce mana feel wasted in this deck, so it could have gone heavier on card draw, equipment, or vehicles to really power up this strategy
Toxrill is a 7/7 Slug Horror that puts a slime counter on each creature you don't control during each end step, providing each creature with -1/-1 for each slime counter on it
Today, most counterfeit cards are designed to pass various tests like the bend test and the light test, and some look almost exactly like the real thing, even upon close inspection (unless you're going really deep and using a jeweler's loupe, which is a good way to weed out fakes but too much work for the average player)
This certainly irked people, but Magic tried to also support them with more obscure designs such as Hundred-Handed One at a higher rarity