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Within more causal metas this works fine. This is far too inefficient for me and who I play against. I wold rather harmonise the temple so it automates and generates a creature quicker. If mana is a problem then maybe priestess wins out.
I harmonize only if I try to turtle in the corner (like when I face a forcemaster). Otherwise it just makes the temple something that should be destroyed, and spending 14 mana and 2 actions on it makes many opponents consider spending about the same to destroy it (it has only 8 life 3 armor).
And anyway, I don't really plan to bring a creature in the second round, since I am actually playing a melee build that would use most of the first rounds on equipping and enchanting the mage.
In a meta where adramelech warlocks are too common, priests might be not so good, and priestesses would usually be a better choice (because they transfer the burn back to you). In a meta where adramelech warlocks are rare enough, after PvS the priest became a very decent mage in my opinion.
With PvS out HA got much better with the inclusion of the breastplate that allows you to gaurd and the noble vanguard there are many options to trigger the HA, my two favorite targets for HA are the asyran defender and white cloak knight. White cloak knight is still a little squishy and I usually invest some mana to protect him while asyran defender has built in defense so I feel there is no need to invest anymore mana into him after making him HA. In my current priest book which I run a temple sentry, a noble vanguard, a temple highgaurd, and two asyran defenders.
Well, even before PvS you would usually run at least 2 creatures, one to guard and one to avenge (when I have enough mana it would be a knight of westlock holy avenger with a guardian angel as the guard, but many times I use cheaper creature). Definitely PvS made some better options for the priest, especially when it comes to attack spells and conjurations, and temple high guard might be a better choice for a guard than the guardian angel in some cases. I think that overall PvS made the priest a decent mage, with some really nice new tricks in his sleeves.