Is Endbringer legal in Standard, Modern, and Commander?

Endbringer is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

What type of card is Endbringer?

Endbringer is a Creature — Eldrazi. Its oracle text reads: "Untap this creature during each other player's untap step. {T}: This creature deals 1 damage to any target. {C}, {T}: Target creature can't attack or block this turn. {C}{C}, {T}: Draw a card."