Updated standings:
http://challonge.com/JuneCup2017
So the new update broke Mew and Mew-EX. They have been banned from the ladder, but that doesn't mean anything in private matches.
If you are using either of those cards in your deck, you are still fine because you have the ability to simply not abuse the bug.
Just be careful. If you misclick and copy an Ability, that's an automatic game loss.
Round ends tonight! Thanks everyone for getting your matches done on time.