ATC stands for artist trading card. They are a takeoff on the sport trading cards we all collected when we were younger (I collected music cards though-just to be different) They are pretty open to interpretation, though the two hard and fast rules are that they must be 2.5" by 3.5", and they must never be sold. Breaking of these rules will cause swift and decisive judgement from the greater artistic comunity! It is also preferable to trade them face to face and you should always do one-for-one trades.Anyway...
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