The AI decks are designed when that deck was the most popular for that meta at the time, so you could test against something you would likely face quite commonly in a tournament/competitive setting.
They aren't really updated, unless it does stay being the top for the next meta, if not you can edit their decks freely, like your own. The AI isn't smart enough to work with every card however, it is just designed with some decks/combos in mind, and everything else just activating whenever it can.
Edited by user
2016-04-11T14:17:22Z
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Reason: Not specified