Is Scrapper Champion legal in Standard, Modern, and Commander?

Scrapper Champion is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Scrapper Champion

Q: What type of card is Scrapper Champion?

Scrapper Champion is a Creature — Human Artificer. Its oracle text reads: "Double strike (This creature deals both first-strike and regular combat damage.) When this creature enters, you get {E}{E} (two energy counters). Whenever this creature attacks, you may pay {E}{E}. If you do, put a +1/+1 counter on it. Power/Toughness: 2/2"