Sidisi, Regent of the Mire {1}{B}
Legendary Creature — Zombie Snake Warlock
BlackCommander: legal
Identity
Black
EDHREC rank
#6,216
Cheapest printing
US$0.32
TCGplayer
Printings
4
{T}, Sacrifice a creature you control with mana value X other than Sidisi: Return target creature card with mana value X plus 1 from your graveyard to the battlefield. Activate only as a sorcery.
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.