Aryel, Knight of Windgrace {2}{W}{B}
Legendary Creature — Human Knight
Identity
Orzhov
EDHREC rank
#8,113
Cheapest printing
US$0.27
TCGplayer
Printings
4
Vigilance
{2}{W}, {T}: Create a 2/2 white Knight creature token with vigilance.
{B}, {T}, Tap X untapped Knights you control: Destroy target creature with power X or less.
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.