Okay... if you want a more direct comparison, try Hectic Offensive. It costs 2 less recruits then Light Cavalry, and does the same amount of damage, when it works. It works when your wall is less then the opponent, as opposed to when the opponent has 16 or less wall, so it's trigger condition is somewhat easier to arrange. When it doesn't work, it does 3 less damage then Light Cavalry, but even so, it's an all-round better card, ignoring keywords.
As an example in the other direction, try Locust Swarm. It costs 1 more recruit then Light Cavalry, and does 10 more damage, when it works. It works only when your opponent has no wall, so it's trigger condition is somewhat harder to arrange. When it doesn't work, it does 5 less damage then Light Cavalry... so it's more situational, but still quite effective.