Because I'm a nice guy and wanted to do you guys a favor, and end this once and for all...
I tested mew. When it works, it's amazing. However, it's like fighting with a shard of glass. One little bump in the road, and that shard of glass shatters, along with the rest of your deck. I found that if my opponent ever did manage to get an attacker out that could consistently OHKO mew (which was all too often, and far too easy considering mew only has 60 HP), there was literally nothing I could do. I got CREAMED by a single Banette one test game. In another, a Luxray owned me to heck and back. It just does NOT work consistently. This is ignoring the fact that Gengar decks will hit you so hard, your cards will probably be smoking by the time they're done with you. Seriously, they don't just beat you. They pulverize you to a fine powder, eat the powder, digest it, and then flush what ever is left down the toilet the next day. You won't catch me using mew when that set hits. At least, not in the way you're using it.