Sidisi, Undead Vizier {3}{B}{B}
Legendary Creature — Zombie Snake
BlackCommander: legal
Identity
Black
EDHREC rank
#2,852
Cheapest printing
US$11.05
TCGplayer
Printings
4
Deathtouch
Exploit (When this creature enters, you may sacrifice a creature.)
When Sidisi exploits a creature, you may search your library for a card, put it into your hand, then shuffle.
Keywords: exploit, 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.