I found myself starting to farm different worlds (other than Underworld) specifically to obtain different colored runes (not necessarily evo runes). Particularly, I am farming Kingdom of the Sands [madness] because I've found myself in a shortage of blue runes to upgrade blue talismans. Since the update, I haven't really gotten any because I've just been farming Underworld (I figured it was the best chances to get rainbo evo shards & runes), but Underworld only gives out purple and yellow runes. I fear that it's a waste of my time though, because I suspect that I won't be getting as many rainbow evo shards/runes... and that's really what I want to farm the most.

Anyone else doing this yet? Any thoughts or alternate suggestions?