Is Mocking Doppelganger legal in Standard, Modern, and Commander?

Mocking Doppelganger is legal in: Legacy, Vintage, Commander.

Mocking Doppelganger

Q: What type of card is Mocking Doppelganger?

Mocking Doppelganger is a Creature — Shapeshifter. Its oracle text reads: "Flash You may have this creature enter as a copy of a creature an opponent controls, except it has "Other creatures with the same name as this creature are goaded." (They attack each combat if able and attack a player other than you if able.) Power/Toughness: 0/0"

Creature — Shapeshifter

Flash

You may have this creature enter as a copy of a creature an opponent controls, except it has "Other creatures with the same name as this creature are goaded." (They attack each combat if able and attack a player other than you if able.)

Power/Toughness: 0/0

Set Commander Legends: Battle for Baldur's Gate

Rarity Rare

Mana Value 4

Artist Igor Grechanyi

Collector # 667

Scryfall