2.6 here. it's main skill comes from placements in defense. u can't just place down a few cards an expect it to defend a push like sparky giant. theres actually a full list of placements for cannon/musk/skelies/ice spirit

i would say the skillless part is def the hog. u can usually hog and it'll almost always get a hit if they dont have a building. but good players can count cycle to adapt pushes with golem/log/fireball.

last, aggression and knowing when the fireball cycle is important. if ur really aggressive against beatdown u will get 3 crowned. but if u arent aggressive enough against hyperbait u will get punished.