So i figured out a way to 100% win every time: choose attributes which gives you the most units (beyond the difficulty meter) and put all infantry units in the forest at the bottom right with the crow at the exact corner. Place the trenches at the edge of the forest and all of your heroes and cavalry the closest you can to the undead king. When you start, bum rush the undead with the tokens using the cav+heroes and it should trigger the king to move if you're close enough. This stops the revival process, splits the undead army into two, gives you enough tokens for later use and causes the king to move (btw hes fairly slow). This will give you enough time to permanently kill off the first wave and then slowly get the king with ranged units. Ultimately, pretty fun but I wish there was a full campaign or at least different maps.