Im building a rune page for a Caster, not a specific hero but just a caster in general, would it be better to stack Magic pen in the Red slots or just Static AP, does anyone have the math behind what would be better?

http://www.leagueoflegends.com/board...ad.php?t=77039

I dont have the specific maths, but in general mpen is better. If you want to look at how they compare at different parts of the game feel free to use this excel program.

Instead of putting item stats into those rows you can put in the values for each set of runes to compare them. You can use it for any hero at any different point in the game and against different MR values of your enemies. Let me know if you have any feedback.

Thanks guys, appreciate it