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Certainly not quite what youre after, but just to get this out of the way: the Dark Arbok card from Team Rocket has an erroneous 1999-23000 Wizards: 465640 77.7 KB This is similar to the Japanese Ancient Mew error which has Nintedo instead of Nintendo

You can tap this with no mana to shoot an attacking dork for 1 damage but only at the end of the combat step, so you'll take it first

It will remain there for the rest of the game

This will set you back in tempo and can easily cost you the game as a result if in a control deck

While I cant find anything confirming why this is, its likely because its on the Reserved List, so Wizards is hesitant to errata something they cant reprint