Is Otharri, Suns' Glory legal in Standard, Modern, and Commander?

Otharri, Suns' Glory is legal in: Legacy, Vintage, Commander.

Otharri, Suns' Glory

Q: What type of card is Otharri, Suns' Glory?

Otharri, Suns' Glory is a Legendary Creature — Phoenix. Its oracle text reads: "Flying, lifelink, haste Whenever Otharri attacks, you get an experience counter. Then create a 2/2 red Rebel creature token that's tapped and attacking for each experience counter you have. {2}{R}{W}, Tap an untapped Rebel you control: Return this card from your graveyard to the battlefield tapped."

Legendary Creature — Phoenix

Flying, lifelink, haste

Whenever Otharri attacks, you get an experience counter. Then create a 2/2 red Rebel creature token that's tapped and attacking for each experience counter you have.

, Tap an untapped Rebel you control: Return this card from your graveyard to the battlefield tapped.