It is easy to find online opponents, but it can be difficult to find someone playing specific standard top tier decks when you want to test one of your creations. The idea here is to create a playtest group. People who want to test their decks against the gauntlet of standard decks should be interested. In return you should be willing to play the standards against someone else who is testing. PM me if you're interested or reply to this thread.
playtest group