REcommendation: pick paladin starter pack, then look for another copy of "parting gift" (when one unit dies, deal 1 damage to enemy portal). Use the global enchantments on top of enemy´s (this is for second and third fight). Have at least 6 peasants. The strategy is simple "parting gift" + start droppping around 100 peasants: You win 100% (unless they take out your parting gift)
 "Cardian"){kind=icon}
 "SAS: Zombie Assault 4"){kind=icon}