Aron, Benalia's Ruin {W}{W}{B}
Legendary Creature — Phyrexian Human
Identity
Orzhov
EDHREC rank
#7,592
Cheapest printing
US$0.17
TCGplayer
Printings
4
Menace (This creature can't be blocked except by two or more creatures.)
{W}{B}, {T}, Sacrifice another creature: Put a +1/+1 counter on each creature you control.
Keywords: menace
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.