Nils, Discipline Enforcer
Legendary Creature — Human Cleric
Oracle Text
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
, where X is the number of counters on that creature.
Rulings (3)
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Wizards of the CoastAll counters on a creature are considered when determining the value of X, not only +1/+1 counters.
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Wizards of the CoastFor each player, choosing a target creature that player controls is optional.
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Wizards of the CoastYour opponents can choose not to pay to attack with a creature with one or more counters on it that attacks "if able." If there's no other player or planeswalker to attack, the creature simply doesn't attack.