As a returning player (not that I was much of a player before), this book was the perfect medium to really grasp how deep and strategic Magic is. Through it I could follow the thought process of the game's best players, understand how they balance their decisions given the available information, and plan ahead to outsmart the opponent.
The thing that stroke me the most, and that I missed the first time around, is how many of the heuristics and situations that arise in-game are parallels to my day-to-day work. I have found that I am more pondered and assertive at decision-making now that I have been familiarizing myself more with Magic and am able to abstract away the heuristics I use in it. One simple example is the acquiring information vs taking action dilemma: you should seek to collect all the information you can prior to taking action, while forcing the opponent to take action with an information deficit. This might seem too simple, and a message well conveyed in other kind of mediums. But if you know anything about learning, you'll know that when the time comes you, more often than not, resort back to your "instinctive" knowledge, and the way to build something into that "section" of our mind is to repeat the process to reinforce the neural pathways.
Reid Duke is an amazing strategist. While this "book" is a collection of articles in some way stuck in time, they might spark in you the curiosity to know more of this great game and find the joys in and outside the gaming table.