It does require tapping, so you'll need to wait a turn to use it normally, but you can easily combine it with Commander Classics Swiftfoot Boots and Lightning Greaves to protect it and haste it in one swing
His other effect, which draws you a card whenever one of your creatures gets through for damage, plays perfectly with the evasion that often features on Horrors, providing you with a steady stream of new Nightmares to haunt your opponents with
Link to my youtube channel that explains this deck card for card:
Jede Bewegung ist flieend, jeder Schlag eine Manifestation der Natur, die durch sie strmt
Is there Lifelink Equipment
Pair this with cards that deal damage to your opponents when your Goblins enter, or leave the battlefield, and you can overwhelm anyone with a quantity that has a quality all of its own