For those looking to decide whether Geomancer was nerfed and if the lifesteal interaction is impactful, please refer to IamIanK's video on the subject.
https://www.youtube.com/watch?v=y9z4yYzja4w
The Brognimancer team featured in that video was a comfortable 100M UNM team pre Geomancer nerf.
In the same gear as he was in pre-nerf (ie lifesteal), the team does not even 1 key UNM.
Even when moving to more defensive gear for Geomancer (Stalwart with similar defences), the team loses over 12M damage.
So this change affects early, mid-game, and even extremely late-game players. If the intent is not to Nerf Geomancer, without his ability to heal from ALL of his damage, he has most definitely been nerfed.
I'd also love a better explanation of why Geomancer was changed when Brogni seems to have a similar mechanic. Has there been an official statement somewhere that Brogni won't be changing at all? I was about to build him this CvC but am hesitant to.