Is Horizon Explorer legal in Standard, Modern, and Commander?

Horizon Explorer is legal in: Legacy, Vintage, Commander.

Horizon Explorer

Q: What type of card is Horizon Explorer?

Horizon Explorer is a Creature — Insect Scout. Its oracle text reads: "Lands you control enter untapped. Whenever you attack a player, create a Lander token. (It's an artifact with "{2}, {T}, Sacrifice this token: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.")"

Creature — Insect Scout

Lands you control enter untapped.

Whenever you attack a player, create a Lander token. (It's an artifact with ", , Sacrifice this token: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.")