Is Deputized Protester legal in Standard, Modern, and Commander?

Deputized Protester is legal in: Legacy, Vintage, Commander, Pauper.

Deputized Protester

Q: What type of card is Deputized Protester?

Deputized Protester is a Creature — Human Warrior. Its oracle text reads: "Menace (This creature can't be blocked except by two or more creatures.) Melee (Whenever this creature attacks, it gets +1/+1 until end of turn for each opponent you attacked this combat.) *Butcher's training, warrior's heart.* Power/Toughness: 2/1"