Arni, Humble Scribe {2}{U}
Legendary Creature — Human Wizard
BlueCommander: legal
Identity
Blue
EDHREC rank
#22,804
Cheapest printing
US$0.24
TCGplayer
Printings
1
Whenever another nontoken creature you control enters, untap Arni.
{T}: Draw a card, then discard a card.
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.