Is Rohgahh, Kher Keep Overlord legal in Standard, Modern, and Commander?

Rohgahh, Kher Keep Overlord is legal in: Legacy, Vintage, Commander.

What type of card is Rohgahh, Kher Keep Overlord?

Rohgahh, Kher Keep Overlord is a Legendary Creature — Kobold Warrior. Its oracle text reads: "Other Kobolds you control get +2/+2. Whenever you cast a Kobold spell, you may pay {2}. If you do, create a 4/4 red Dragon creature token with flying. Whenever you cast a Dragon spell, create a 0/1 red Kobold creature token named Kobolds of Kher Keep."