Kaervek, the Spiteful {2}{B}{B}
Legendary Creature — Human Warlock
BlackCommander: legal
Identity
Black
EDHREC rank
#10,332
Cheapest printing
US$0.29
TCGplayer
Printings
4
Other creatures get -1/-1.
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.