Tivash, Gloom Summoner {4}{B}
Legendary Creature — Human Warlock
BlackCommander: legal
Identity
Black
EDHREC rank
#10,952
Cheapest printing
US$0.37
TCGplayer
Printings
3
Lifelink
At the beginning of your end step, if you gained life this turn, you may pay X life, where X is the amount of life you gained this turn. If you do, create an X/X black Demon creature token with flying.
Keywords: lifelink
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.