Nils, Discipline Enforcer

Legendary Creature — Human Cleric • Mana cost: {2}{W} • Commander 2021 • Rare

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.

Illustrated by Magali Villeneuve.