Morde W Bug
The new patch seems to have introduced a bug in Morde's W, where it will not target according to your cursor. Instead it seems to randomly choose a champ close to you (although NOT necessarily the one closest to you) to pair with. I was able to reproduce this even when my mouse was on the opposite side of the screen from the champ that ultimately received the W buff.
This may also affect his R as well, although I wasn't able to reproduce it as reliably. This bug occurred with 100% regularity in an ARAM match today.