Is Labyrinth Adversary legal in Standard, Modern, and Commander?

Labyrinth Adversary is legal in: Modern, Legacy, Vintage, Commander.

What type of card is Labyrinth Adversary?

Labyrinth Adversary is a Creature — Minotaur. Its oracle text reads: "Trample (This creature can deal excess combat damage to the player it's attacking.) Whenever you attack, you may pay {1}{R}. When you do, target creature can't block this turn. *It had claimed many lives in the Labyrinth before it met its end by Kassandra's hand.* Power/Toughness: 4/3"