I really dislike aggressive factions and mainly play to get the "Uncertainty" artifact... it's difficult for Orcs to attack right away, especially if the hero is a Pyromancer... and if you place a wall of fire in the center of the battlefield, it will be difficult for them. The main thing is to bring in reinforcements.
In principle, that makes sense! I'm curious, I'll try this tactic! I understand that I need to get the second upgrade for the Priests?