Thoughts coming o my mind regarding this:
Runecalculator ->
http://oldsch00l.lebanni.net/runecalcEN/
( i have 3 Lv X Runes / i want 3 Lv XIII Runes)
But does this calculator consider the fact that CS are now multiplied by 12? at some point they got changed
Consider Price for BC and purple Bonuscrystals
(you might want to wait until discount for BC)
There seems also to be some connection to prophetic cards if i remember correctly but i dont know the details, someone else may explain this
and do the math
old thread regarding runes; likely outdated!
Cost of full level 13 Runes, they got cheaper as it seems