Is Monstrous Onslaught legal in Standard, Modern, and Commander?

Monstrous Onslaught is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Monstrous Onslaught

Q: What type of card is Monstrous Onslaught?

Monstrous Onslaught is a Sorcery. Its oracle text reads: "Monstrous Onslaught deals X damage divided as you choose among any number of target creatures, where X is the greatest power among creatures you control as you cast this spell. *"Regards from Peema." —Rishkar*"

Sorcery

Monstrous Onslaught deals X damage divided as you choose among any number of target creatures, where X is the greatest power among creatures you control as you cast this spell.

*"Regards from Peema."

—Rishkar*

Set Commander Legends

Rarity Uncommon

Mana Value 5

Artist Slawomir Maniak

Collector # 244

Scryfall