With such a minimal commitment of mana, this Helm could deal those last few points of commander damage you need for the win. It can go on any creature though. Any deck that loves enchantments can use it.
Also, Trinket Mage can grab it, being a one mana artifact. Being an equipment, Quest for the Holy Relic, Steelshaper’s Gift, Stoneforge Mystic, and Stonehewer Giant can also seek it out. You could get it with Relic Seeker from Magic Origins, too.
Will it work in Constructed? Green/Black Constellation could use it. Heroic could use it. But where does it fit in the list? Bogles in Modern could use it. But again where does it fit? Prison decks may find a slot or two and stick it on one of the few creatures in the deck. But that is hardly a top tier deck. Still, it would be cute tech.
In Commander, it can fit because you have 99 slots to consider. In constructed decks, there isn't much give room, and the decks in standard now that can use it to the best effect are losing all of the Theros cards in October.
Still, Helm of the Gods could prove to be an absolute killer. It's a card that gets better as you go. You just play it as soon as you need it. It could be a game-ender, and even a 3/3 boost is worth the investment. Unlike an Aura, it's usually going to stick on the board when the equipped creature is dealt with. It may never be a money card, but if a ton of enchantments are going to be in play for you, the Helm at least needs to be considered.