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(This includes disguise, cloak, and in games involving older cards, morph and manifest, as well as a few other effects that turn cards face down.) Common methods for doing this include using markers or dice, or simply placing them in order on the battlefield.
Atraxa, Grand Unifier is the kind of card that makes people quit as soon as you play it or cheat it onto the battlefield
Definitely worth checking out if you want more
Redditor CardOfTheRings accuses CGC of "trying to legitimize their second rate grading service with a publicity stunt," reasoning that no one would pay this value when there are "records of similar quality BGS cards capping out at ~500,000." Many others express similar sentiments less politely, with some calling it "blatant laundry", which is meant not in the sense of money-laundering but in terms of artificially pumping up card values to inflate the market more generally