Honestly I think folks are delusional (or perhaps just haven’t played much Priest lately) if they think zoo/board Priest can be made relevant by dropping the cost of a single buff by 1 mana!
Yes getting Extra Arms t2 on a t1 girl is a powerful play, but that’s it! we haven’t got any other tempo plays, if the deck doesn’t have a 1 drop and an Extra Arms in your opening hand you’ve lost, we don’t have a flame imp!
Plus Priests have a very hard time drawing cards unless they devote their whole deck to it, you can’t be droppoing acolyte of pain on 3 in a tempo deck.
Look at Priest’s Lackey generator, EVERY other class gets their Lackeys upfront and guaranteed, even flipping Warrior!, all except priest, let’s face it the class is not designed for tempo, our minions are weak and our hero power is bad(for tempo, probably just straight up bad, but definitely bad for tempo), I don’t think one half decent buff is enough to make this deck viable.
The only time a board control priest was viable was dragon priest with “secret agent, coming through” and a assymetrical boardwipe in Dragonfire potion, as well as a bunch of overstatted dragons/minions (Twilight guardian, Wyrmrest agent) and we had a good buff in Velen’s chosen too, I don’t think we’ve got anywhere near that card quality available to Priest in this rotation.
I don’t even think Miracle Priest will want Extra Arms, 2 mana is too much , they need their spells to cost zero, 1 at the most, it’s too slow for that deck, and even if it was used I find it hard to believe it will raise it above tier 3, particularly as every other class gets a buff.
I’m predicting it now, priest bottom of the meta , at less than 5% representation.