Luna's Pocket Galaxy from 5 to 7 mana (Original card) Will probably go back to seeing next to no play. At 7 mana it's just too late against anything not a control deck and a dead card otherwise
Dr. Boom from 7 to 9 mana I think it will alleviate some issues but ultimately this does nothing to curb the warriors ability to just RNG infinite removal which to me was the most annoying thing about facing this card, win or lose.
Conjurers Calling from 3 to 4 mana Hard to say what this will do. It does put off early giant pressure in some cases. Most of my experience with this card both playing and facing is that it got played late game anyway.
Extra arms from 2 mana to 3 mana (Original) I don't think this is going to effect combo priest much if at all. It can still be hard to keep minions below a certain threshold and with Healing circle DS and IF they can still burst you down easily from full health
Barnes from 4 to 5 mana People are still going to complain about big priest. No real change here.