For just one mana, it essentially doubles your chances of a good roll on all future dice effects
Urza, Lord High Artificer isnt a commander that's here to play fair: It's one of the top cEDH commanders (which is even more impressive given the hard time mono-colored commanders have at the highest tier), and it already has another crazily priced printing: Its Mystery Booster 2 version hovers around $380
And who doesn't like throwing around tons of damage
When summoned, Kaldra immediately equips all three of its signature items, resulting in a 9/9 indestructible, first strike, trample, haste monstrosity that can exile those it defeats in combat
Skullclamp's actual value as an equipment is negligible
You can tap the Goggles for 1 red mana, so they have a minor ability as a spell adjunct, and then, you gain a free Fork of something as well tacked on