Nils, Discipline Enforcer {2}{W}
Legendary Creature — Human Cleric
WhiteCommander: legal
Identity
White
EDHREC rank
#3,891
Cheapest printing
US$0.33
TCGplayer
Printings
3
At the beginning of your end step, for each player, put a +1/+1 counter on up to one target creature that player controls.
Each creature with one or more counters on it can't attack you or planeswalkers you control unless its controller pays {X}, where X is the number of counters on that creature.
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.