A lot of ppl didn't even notice, but this rune worked well with phase rush. I did get the chance to test it on the PBE. It allowed you to get a controlled move speed buff from which procing phase rush was much easier.
PPL complained about losing ultimate hat but what a lot of ppl don't realize is that ultimate hat worked multiplicatively with CDR. At 40% CDR, ultimate hat only gave an additional 10% CDR to the ult.
Honestly, I felt nimbus cloud was way more useful for engaging and disengaging. And now its seems riot is not bringing it back.
Am I the only one who thought nimbus cloud was a good rune?