Thank GOD. Because that interaction was BS.
I wouldn’t call it a buff. Technically it would be a nerf because before if you controlled him or copied him it would summon the stuff for the original owner.
For example, if you played Sargeras and I played Reverberations and on MY Sargeras I clicked to summon the 6/6 demons, it would summon them for YOU. Now it won’t help you at all…so technically, it’s a nerf in that regard. Sure, you can’t use the Nether so that might be considered a buff, but overall it’s the right change as far as I’m concerned. I lost a game because of that interaction.