Urza, Powerstone Prodigy {2}{U}
Legendary Creature — Human Artificer
BlueCommander: legal
Identity
Blue
EDHREC rank
#12,524
Cheapest printing
US$0.21
TCGplayer
Printings
1
Vigilance
{1}, {T}: Draw a card, then discard a card.
Whenever you discard one or more artifact cards, create a tapped Powerstone token. This ability triggers only once each turn. (The token is an artifact with "{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.")
Keywords: vigilance
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.