Other artifact creatures you control have flying, trample, indestructible, and haste.
Krang is a colorless commander, so you build an all-artifact (and Eldrazi) creature army powered by mass mana rocks. Ramp hard early with Sol Ring, Tron lands, and Eldrazi temples, drop Krang or your fatties, and immediately swing with an evasive, indestructible, hasty board. Most games end by alpha-striking with trampling fliers that can't be killed by removal-light tables.
Indestructible + flying + trample turns every artifact creature into an unblockable, board-wipe-proof threat
Haste means no summoning sickness, so the army attacks the turn it lands
Color identity is colorless, letting you run every colorless staple and powerful artifact land/rock
Built-in evasion solves the biggest problem of go-wide artifact decks
Nine mana is brutal; Krang is slow and the deck stalls without heavy ramp
Indestructible doesn't stop exile, bounce, -X/-X, sacrifice, or tap effects
No access to colored interaction, card draw, or removal beyond colorless artifacts