Is Fire Lord Zuko legal in Standard, Modern, and Commander?

Fire Lord Zuko is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Fire Lord Zuko?

Fire Lord Zuko is a Legendary Creature — Human Noble Ally. Its oracle text reads: "Firebending X, where X is Fire Lord Zuko's power. (Whenever this creature attacks, add X {R}. This mana lasts until end of combat.) Whenever you cast a spell from exile and whenever a permanent you control enters from exile, put a +1/+1 counter on each creature you control."