Is Loyal Warhound legal in Standard, Modern, and Commander?

Loyal Warhound is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Loyal Warhound

Q: What type of card is Loyal Warhound?

Loyal Warhound is a Creature — Dog. Its oracle text reads: "Vigilance When this creature enters, if an opponent controls more lands than you, search your library for a basic Plains card, put it onto the battlefield tapped, then shuffle."

Creature — Dog

Vigilance

When this creature enters, if an opponent controls more lands than you, search your library for a basic Plains card, put it onto the battlefield tapped, then shuffle.

Set Adventures in the Forgotten Realms

Rarity Rare

Mana Value 2

Artist Dmitry Burmak

Collector # 23

Scryfall Gatherer