Is Sarkhan the Masterless legal in Standard, Modern, and Commander?

Sarkhan the Masterless is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Sarkhan the Masterless

Q: What type of card is Sarkhan the Masterless?

Sarkhan the Masterless is a Legendary Planeswalker — Sarkhan. Its oracle text reads: "Whenever a creature attacks you or a planeswalker you control, each Dragon you control deals 1 damage to that creature. +1: Until end of turn, each planeswalker you control becomes a 4/4 red Dragon creature and gains flying. −3: Create a 4/4 red Dragon creature token with flying."