I see where you're coming from, but unfortunately I don't know if you can get away with taking the Powers description out of the book. Even if you hide the math, an Entangle with Area Effect, Requires a Roll, and Obvious Accessible Focus--these all have in-game effects that can't be anywhere but the Powers section. The best you could do would be to reorganize the entry for each Power such that the game effects are on top and the costs and specific modifiers are on the bottom, but I don't know how much space that'd save. Taking out Powers means a campaign with no magic, no non-human races, and no monsters. It could be done, but...