Ob Nixilis, the Fallen {3}{B}{B}
Legendary Creature — Demon
BlackCommander: legal
Identity
Black
EDHREC rank
#1,945
Cheapest printing
US$2.70
TCGplayer
Printings
6
Landfall — Whenever a land you control enters, you may have target player lose 3 life. If you do, put three +1/+1 counters on Ob Nixilis.
Keywords: landfall
Every printing
highest TCGplayer market first; a card with only a thin single listing shows its low
Secret Lair · Halo Foil
Ob Nixilis, the Fallen
SLC · 42
TCGplayer market
US$36.96
Secret Lair
Ob Nixilis, the Fallen
SLC · 15
TCGplayer market
US$5.79
The List
Ob Nixilis, the Fallen
PLST · IMA-101
TCGplayer market
US$5.33
Ob Nixilis, the Fallen
IMA · 101
TCGplayer market
US$5.00
Ob Nixilis, the Fallen
ZEN · 107
TCGplayer market
US$4.37
Ob Nixilis, the Fallen
TDC · 192
TCGplayer market
US$2.70
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.