As a reminder, here is the pertinent Oracle text for it: A deck can have any number of cards named Relentless Rats. Well, it seems from the wording, rulings, and rule that it would not be allowed in multiples, but Sheldon, a couple of years ago, made this post in the forums: The RC has discussed it and for the time being thinks that multiple Rats is OK
The artwork is packed full of details, such as the lightning that is piercing through the dark clouds, or the fisherman that is leaning over their boat to look up at the epic Legendary Pokmon
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Tutors should be important for any competitive deck, where I would say most casual decks probably shouldnt run them
If you're only picking one upgrade: go Snow White - Unexpected Houseguest to four copies