This ability is essentially useless. I have never seen it actually go off in pvp, although I have seen it used before a couple of times. The thing is, though, the match usually ends before then. In pve, I have intentionally kept the fight going with a wild pet, just to see it hit, and when it did, it missed my pet anyway.
Totally disagree with that.
This ability is the core of 2 of my Pet Daily rotations. Those pets you can't kill because they constantly shell (Ti'un) or heal (Lucky Yi) themselves die instantly with Apocalypse.
I use same team for both (roach/beetle with Apocalypse, and 2 rabbits with dodge and burrow).