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But if you tried to sell the same thing to a shop, or in a single lot on ebay, it would sell for only a small fraction of this

I mean, if you play it on turn three, it is a 3-mana 2/2 that leaves behind a 1/1, and thats a card you would play a decent chunk of the time -- and as I said, it scales all game long, leaving behind more and more formidable tokens that will then also leave behind other tokens if they have enough counters

The ground gets bogged down, people have ways to deal three, and stuff just goes wrong more than you might expect

There are also plenty of ways to deal damage to your own creatures, either with direct damage spells, or cards like Forerunner of the Empire