Orcs versus High Elves.

On small maps, Haggeesh is, in my opinion, an overpowered hero; she is usually banned, but if you still choose her as the main hero, focus on developing Fire Arrows, War Machines, and Logistics. By the beginning of the second week, you can realistically gather 70-100 centaurs. Haggeesh, along with them and a ballista, turns into a bloodthirsty killing machine; most neutral creatures are eliminated without losses through auto-combat. If the opponent is Haven, I doubt they can do anything against such a monster.