What’s particularly interesting about Dragon Horn Hunter is the fact that he’s a normal Monster, a Level 6 DARK-Attribute Warrior with 2300 ATK and 1000 DEF. These stats are nothing special. However, as a Pendulum Monster, when he lives in one of your two Pendulum Zones he has a Pendulum Scale of 3 and gains this effect: “All Normal Monsters gain 200 ATK. You take no battle damage from battles involving Normal Monsters you control.” That’s a very good effect.
Dragon Horn Hunter really pushes you to play Normal Monsters. As it turns out, there’s an easy way to search out this card: Summoner’s Art from Tactical Evolution. Also, being a DARK-type monster is good, as it can provide the necessary DARK component for many other cards. It also means that playing classic Normal Monsters such as Summoned Skull - also a potential target for Summoner’s Art - becomes far more plausible.
The greatest con to this card is obviously the fact that he relies quite heavily on the Pendulum mechanic. You’re going to need to push out high-level Normal Monsters to simply overpower your opponent if this guy is going to make much of a difference. The ATK boost he gives isn’t much, but taking no battle damage from battles involving your Normal Monsters could make a Normal Monster based Pendulum Summoning deck a realistic option.
As it turned out, Pendulum decks with Normal Pendulum Monsters would turn out to be competitive. As we saw with the Space Time Showdown Starter Deck, Normal Monsters were being pushed with the advent of the Pendulum Summoning mechanic. In 2016, this card was good enough to appear in some competitive Pendulum Magicians decks at a single copy.