So yes, I can confirm that this format has a huge effect on bookbuilding.
I built the book around the anticipation of a ZombieBrute Battle of Attrition, packing ignites, Agonies, Chains of agony and multiple Molochs to get as much direct damage onto the Zombies as possible, without engaging them. The Magma Golem was also meant to slowly melt them away without giving them any bloodthirst-Attackbonus.
I even put Pillar in there.
With Attackspells usually not being worth their mana against resilient and the obvious inclusion of Hauberk and Elemental Cloak, I didn't even bother with attackspells. In Hindsight, using creatures that are actually able to chase and hurt your mage and including at least one fireball to get rid of the idol would quickly solve a problem or two for me...
I'll just take this as a lesson that one can always overthink the counterbuilding.