A simple text search can put every counter spell printed at our fingertips
If you collect all 20 cards from a certain deck, you will be able to use that deck at any time
However, Magic officiates will always have a preference, so those white-bordered Islands are only going to be more valuable as time goes on.
Representing the not so common trainers is a must, and it looks like they might go the S&M trainer route I actually beg they give some love to sun and moon outside of pocket, the Lunala art is actually so pretty #18 I hope that adding another trainer doesn't mean that the existing ones won't receive support, like they did with N
I covered the best goblins for Commander recently, but the competitive scene also has several great options
Back in March we got to reveal Magic: The Gathering's very first Spider-man cards as part of a special Scene Box outside of the main set