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Wizards are well aware of the secondary market and they do respect the fact that players and collectors paid a hefty sum for their cards (Good guy Wizards)

That said, this remains a powerful sideboard piece against decks like Amulet Titan

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However, since this card can also be used as a Negate, it shouldn't be bad

The Wandering Emperor, when cast on the opponents turn, enters the battlefield, exiles a creature, and gains two life

There are narrow exceptions where a judge may issue a proxy during an event if a card is accidentally damaged, but thats not the same thing as bringing your own proxies