to anyone who would like to trade, i will give you 1 water rune, 1 earth rune, and 1 mind rune for 1 air rune OR 1 fire rune

Aren't you loosing out on value o,O? Or is Air and fire runes an ultimate need for you?

i use airs and fires way more than earth and water. i happen to have a huge excess of earth and water runes, up to the point i'd hand them out for fires.