Best way to win the campaign is having 5x sacrifice cards, mages, recruits and builders. You can play them at your first turn and then you both have only 1 builder and recruit. Only other thing you need is luck, cause it's hard to win if you die before your 2nd turn xd.
 "Greedy Mimic"){kind=icon}
 "Hardest Free Game"){kind=icon}
 "Ancient Jewels Rush"){kind=icon}
 "Castle Wars 2"){kind=icon}
 "Super Hot"){kind=icon}