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Interesting how the lack of trading in Arena really keeps this bug (and most bugs) from being truly catastrophic.

If you did the same thing in MTGO, where you can actually trade those cards for event tickets, then sell those event tickets to a 3rd party for real money...well, then a bug like this has the potential to mess up that whole economy.

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Yes, and this is the kind of things that happened with Diablo 2 back in the days in the Realms. Abusing different bugs for duplicating items ended up completely ruining the whole game economy. I know some people who made a lot of money selling those on Ebay.

Discloser: former game hacker.

My favourite hacks in trading have always been of the non-technical variety. For instance I remember reading of someone making an absolute fortune on the Diablo 3 auction house, because you could list items on it either for in-game gold or real money. But some people have quickly noticed that it's very easy to make a mistake and list something for 5 gold instead of 5 dollars, and people have in fact been doing it. With a bit of automation(buy anything worth less than X gold and of legendary rarity), people have made an absolute killing, tens of thousands of dollars a month just buying items for cheap and selling them for more. A little bit scummy, but no technical hacking needed, just a simple observation that the UI design of the auction house makes this kind of mistake really simple to make and no checks have been implemented to prevent it(no "this is a legendary item and you're listing it for 5 gold - proceed?").

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