It's not the old Soul Swap though. They reused the name but it's now just an ability that instantly puts your main dots on the target, at the cost of 1 shard.
Old Soul Swap was hilarious and super difficult to use. Breathe in dots with full snap shot buffs (when snap shotting was still a thing), wait till proper moment to breathe them out again, and then juggle the breaths with your clockwork timed trinkets (when those were still a thing) to always have max buff dots available.
But it's not that Soul Swap, for better and for worse.
Soul Swap