If you get a chance to choose General Sloan, and you're alloted 21+ Mana for the battle, you may want to consider this summoner.
Many people are afraid of choosing a team full of ranged attackers, because they can't attack in the first position. However, General Sloan is here to help - providing +1 damage for ranged attacks. Archers tend to move fast, which helps dispose of the opponent's tank relatively quickly.
Make good use of this combo during battles where shield isn't allowed, and be wary with monsters with shields that may regenerate i.e. Keyla Frendul.