Is Knight of the Reliquary legal in Standard, Modern, and Commander?

Knight of the Reliquary is legal in: Modern, Legacy, Vintage, Commander, Historic.

Knight of the Reliquary

Q: What type of card is Knight of the Reliquary?

Knight of the Reliquary is a Creature — Human Knight. Its oracle text reads: "This creature gets +1/+1 for each land card in your graveyard. {T}, Sacrifice a Forest or Plains: Search your library for a land card, put it onto the battlefield, then shuffle. *"Knowledge of Bant's landscape and ruins is a weapon that the invaders can't comprehend." —Elspeth Tirel* Power/Toughness: 2/2"