With a Stranger Things vibe and some genuinely unsettling art, Duskmourn is looking to tap into a niche that the MTG universe has rarely investigated directly, choosing to include hints of horror (like Eldrazi transformations) or more traditional fantasy scares (think Innistrad - before the Eldrazi, anyways)
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One winner would be selected for each card, and the artists name would be printed on the card, which was deemed illegal in competitive tournament play
The only way I see them detecting anything is if you leave polish on the card or on the edges
Either way, Ninja's Blades is a solid deal with a large payout when it connects, so it should be a good rare in Limited
9 The Sorcerer's Hat Speak It Into Existence What makes a good card