Sort of related: I had a heap of 3* chance talismans that I thought I'd upgrade to help with this challenge.

Oh, I have no 1* yellow evo runes.... OK, I'll just go farm some.

I've spent over a day running Garden of Life I-IV and NOT ONE! Aaaarrrrggghhhh

Got about 50 million 1 & 2* green evo runes, but not one single, lonely 1* yellow evo rune. lol. I guess Ill just have to hold out hope for only ever dropping 4* yellow talismans in the future! :P