Hancock, Ghoulish Mayor {2}{B}
Legendary Creature — Zombie Mutant Advisor
BlackCommander: legal
Identity
Black
EDHREC rank
#6,413
Cheapest printing
US$1.10
TCGplayer
Printings
4
Each other creature you control that's a Zombie or Mutant gets +X/+X, where X is the number of counters on Hancock.
Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)
Keywords: undying
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.