Are there any limits on these kinds of things? I know you usually don't see more than two Power Sets, but is it possible/reasonable to have three or more? The issue comes into play for me when a hero that's already got two Power Sets picks up another character's Gear (say if Spider-Man picks up Captain America's shield). What I see possibly happening is Spider-Man picks up Cap's shield, and uses a die from his Spider Powers, Web-Slinging, and the Vibranium-Alloy Shield. Does this work?
I haven't seen anything that puts a limit on the number of Powers in a Power Set either. Sentry seems to be the heavy hitter here with 6 in his Power of a Million Exploding Suns set.
Do these limitations exist? Can someone give me a page number in case I missed it? I'm really curious about this.