Is Aerialephant legal in Standard, Modern, and Commander?

Aerialephant is legal in: Commander. It is banned in: Legacy, Vintage, Pauper.

What type of card is Aerialephant?

Aerialephant is a Creature — Elephant Performer. Its oracle text reads: "Flying When Aerialephant enters, you get {TK}, then you may put a sticker on a nonland permanent you own. *Everyone wants to talk about the elephant in this room.* Power/Toughness: 3/2"