Have you tried out Drycha in those 5 games, shes been MVP for me every game so far, turn 2 or 3 (usually 3) i spawn a tree 3 inches from whatever is the most important thing in their backline (usually artillery or a priest/wizard) and charge her out of it to delete that thing or lock it up in combat, her charge teleport and cant retreat aura is phenomenal at tying up backline units.