Has red box
Foundations is intended to be a return to the basics, making it easier for new players to really get a handle on building decks, playing different formats, and learning the game
Usually, Id recommend only buying one as a casual player, but their comparably low price means it may be a good option to both so you can try each and play with people who dont have their own decks
just focus on tweaking your last few slots and perfecting the match-ups, for that is the path to victory
Deal with the Devil: His deal with the Door is treated as this, with it being stated that he'll gain great power, but lose what he holds most precious (and he comes up with about half a dozen examples of what that is by the end of the series, with it being left deliberately ambiguous as to what Yuma gave up)
Again, that isn't the most busted way to use Subtlety, but the beauty of that evoke is that it presents you with different options