I could be wrong, but I think there's a matching bias based on the deck you are using (or possibly your mark). I played T50 the other day, almost all day, hoping to get a PuppyChow farm with a vamp dagger. I didn't face him one time in about 250 matches using my entropy speed deck. I changed to a mono darkness deck and got him like 3 times in a row, along with a bunch of other decks I hadn't seen all day.
Can someone confirm or deny this?