Is Neyith of the Dire Hunt legal in Standard, Modern, and Commander?

Neyith of the Dire Hunt is legal in: Legacy, Vintage, Commander, Historic.

Neyith of the Dire Hunt

Q: What type of card is Neyith of the Dire Hunt?

Neyith of the Dire Hunt is a Legendary Creature — Human Warrior. Its oracle text reads: "Whenever one or more creatures you control fight or become blocked, draw a card. At the beginning of combat on your turn, you may pay {2}{R/G}. If you do, double target creature's power until end of turn. That creature must be blocked this combat if able. ({R/G} can be paid with either {R} or {G}.)"

Legendary Creature — Human Warrior

Whenever one or more creatures you control fight or become blocked, draw a card.

At the beginning of combat on your turn, you may pay . If you do, double target creature's power until end of turn. That creature must be blocked this combat if able. ( can be paid with either or .)