The Trainer imo is bleh, it doesn't have the potential it should. It should be more than just the same game but off-the-record testing of a deck. It should really allow you to pick your opponent, a specific preset AI or a deck of your choice. This is a suggested solution for PvP deck testing, since Top 50 isn't really enough. Even when Top 500/0 is in place, it still is missing the fact that you are trying to test a deck against a given situation, say against speedy rushes, deckout stalls, etc., so that you are spending your time testing with maximum efficiency.