Rivaz of the Claw {1}{B}{R}
Legendary Creature — Lizard Warlock
Identity
Rakdos
EDHREC rank
#2,993
Cheapest printing
US$0.79
TCGplayer
Printings
5
Menace
{T}: Add two mana in any combination of colors. Spend this mana only to cast Dragon creature spells.
Once during each of your turns, you may cast a Dragon creature spell from your graveyard.
Whenever you cast a Dragon creature spell from your graveyard, it gains "When this creature dies, exile it."
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.