It may have a bigger body and two more abilities, but when you're already Overrun-ning your opponents' boards, it doesn't make much a difference
Oh, and here's a cool tip: If you put a +1/+1 counter on an enchantment and then animate it, the counter still applies once its animated, and this works for other types of counters too
it's worth $2.50 as of this writing
To be honest, you might be better off running Iron Man in the 99 of a Captain America deck, simply because Cap also cares about equipment with high mana costs, cheats equip costs, and crucially adds white to your color identity
Interestingly, this is not even the deck with the highest win rate in Magic: The Gathering 's Standard format, but recent tournaments see it as the single most used deck overall