Gwenom, Remorseless {3}{B}{B}
Legendary Creature — Symbiote Spider Hero
BlackCommander: legal
Identity
Black
EDHREC rank
#2,717
Cheapest printing
US$4.08
TCGplayer
Printings
4
Deathtouch, lifelink
Whenever Gwenom attacks, until end of turn, you may look at the top card of your library any time and you may play cards from the top of your library. If you cast a spell this way, pay life equal to its mana value rather than pay its mana cost.
Keywords: lifelink, deathtouch
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.