Your units start with Unground, Stag Heart
Your idols start with 5 health
Your opponent starts with 1x boss Mangonel
Your opponent starts with 2 resources
The trick is to trade until you get a strong board presence, taking little shots at the idols as you can. Your units will become very big with stag heart. Don't be afraid to swing at a row that's already been destroyed, you don't want to destroy your entire army with Unground.
This is a modified version of tempo order with some magic resist from Resonant Helm, Effigy of the Queen, and Grounds of the Fallen, which helps mitigate some of the damage from Unground.
Make sure to do the math before you take out an idol, you don't want to start off a chain reaction that will annihilate your army.