Context Analysis: Knowing When To Cut The Good Cards
It is very dangerous to point at a card and say, “That card won me that game; therefore, it should be in my deck.” There’s always more to the story than whether or not the card was good in one particular game or in one particular match. Even Feast of Worms can win games under the right circumstances.
That’s why this concept of negative context analysis is so tough to come to grips with. You improve your deck only very slightly when you realize that a good-in-general card should really be replaced by a jankier card that fits your deck better. If a certain “good” card wins you five out of ten playtest games, you’ll probably never stop to think whether a different card would have won you six out of ten.