Ultron, Artificial Malevolence {3}
Legendary Artifact Creature — Robot Villain
ColorlessCommander: legal
Identity
Colorless
EDHREC rank
#4,419
Cheapest printing
US$7.22
TCGplayer
Printings
3
Whenever another nontoken artifact you control enters, you may pay {2}. If you do, create a token that's a copy of it. If the token isn't a creature, it becomes a 2/2 Robot Villain creature in addition to its other types.
Every printing
highest TCGplayer market first; a card with only a thin single listing shows its low
In short
A Commander deck is a commander and 99 other cards, one copy of each (except basic lands), all inside the commander's colour identity. Paste a full list into the deck price calculator to price it and check it against the format.