Is Nils, Discipline Enforcer legal in Standard, Modern, and Commander?

Nils, Discipline Enforcer is legal in: Legacy, Vintage, Commander.

Nils, Discipline Enforcer

Q: What type of card is Nils, Discipline Enforcer?

Nils, Discipline Enforcer is a Legendary Creature — Human Cleric. Its oracle text reads: "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."

Legendary Creature — Human Cleric

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.