Is Guardian Sunmare legal in Standard, Modern, and Commander?

Guardian Sunmare is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Guardian Sunmare

Q: What type of card is Guardian Sunmare?

Guardian Sunmare is a Creature — Horse Mount. Its oracle text reads: "Ward {2} Whenever this creature attacks while saddled, search your library for a nonland permanent card with mana value 3 or less, put it onto the battlefield, then shuffle. Saddle 4 Power/Toughness: 5/5"

Creature — Horse Mount

Ward

Whenever this creature attacks while saddled, search your library for a nonland permanent card with mana value 3 or less, put it onto the battlefield, then shuffle.

Saddle 4

Power/Toughness: 5/5

Set Aetherdrift

Rarity Rare

Mana Value 5

Artist Christina Kraus

Collector # 15

Scryfall