Fain, the Broker {2}{B}
Legendary Creature — Human Warlock
BlackCommander: legal
Identity
Black
EDHREC rank
#3,395
Cheapest printing
US$1.44
TCGplayer
Printings
4
{T}, Sacrifice a creature: Put two +1/+1 counters on target creature.
{T}, Remove a counter from a creature you control: Create a Treasure token.
{T}, Sacrifice an artifact: Create a 2/1 white and black Inkling creature token with flying.
{3}{B}: Untap Fain.
Keywords: treasure
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.