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)
While, in specific contexts, they are the best cards the game has ever seen, our answer to this question actually lies outside of these cards
The ease with which you can enable this makes it one of, if not the best alternate win condition in Commander
Instant Color tag templates(None) Eerie Interlude Exile any number of target creatures you control
Put one of them onto the battlefield tapped and the other into your hand, then shuffle
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