Is Territorial Aetherkite legal in Standard, Modern, and Commander?

Territorial Aetherkite is legal in: Legacy, Vintage, Commander.

What type of card is Territorial Aetherkite?

Territorial Aetherkite is a Creature — Cat Dragon. Its oracle text reads: "Flying, haste When this creature enters, you get {E}{E} (two energy counters). Then you may pay one or more {E}. When you do, this creature deals that much damage to each other creature. Power/Toughness: 6/5"

Territorial Aetherkite

Creature — Cat Dragon

Flying, haste

When this creature enters, you get (two energy counters). Then you may pay one or more . When you do, this creature deals that much damage to each other creature.