Even the box itself had warning signs, such as the code on the label not matching up with other known booster box cases or its own barcode, and it being faded in a way that's inconsistent with labels from the time
If you want a deck builder that also knows what cards you own, start with GrimDeck and build from your collection instead of another wishlist
A powerful Mew -- if you're lucky enough to own one -- is a good contender to a Mew two, even though it's not quite as powerful
Also no (that title probably goes to Ghave, Guru of Spores)
This shouldn't be such a big problem, though, as Grimlock is definitely best as a commander, where he can be seen by all at any time
They work so well in tandem that good decks need a touch of both to perform their best