Kaervek, the Punisher {1}{B}{B}
Legendary Creature — Human Warlock
BlackCommander: legal
Identity
Black
EDHREC rank
#6,589
Cheapest printing
US$0.34
TCGplayer
Printings
4
Whenever you commit a crime, exile up to one target black card from your graveyard and copy it. You may cast the copy. If you do, you lose 2 life. (Targeting opponents, anything they control, and/or cards in their graveyards is a crime. Copies of permanent spells become tokens.)
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.