@i-NormI agree. Per the explanation this sounds like a good idea, but it doesn't work at all in practice. It doesn't warp you far enough away from where you get knocked to really matter. I always die right after coming out of the phase. I actually have had better luck this season using wraith and phasing right before I'm going to die in a fight.
For instance, it told me to be wraith 4 times in battle pass dailies so I used wraith for the first time in like 2 seasons, and I actually got a kill since this cheater had 2 of my teammates almost gone and I phased and went behind and finished him off before he could even see where I went. While he was doing his fancy flipping crap and knocking my two teammates I shot him from behind (he was already cracked) so this shows me just using Wraith will give you a better advantage over advantage players than the rift relic will. With the rift relic they should have it heal you or warp you far enough away where it acts as a second chance. The way it is now it serves no purpose.