Is Relic Golem legal in Standard, Modern, and Commander?

Relic Golem is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Relic Golem?

Relic Golem is an Artifact Creature — Golem. Its oracle text reads: "This creature can't attack or block unless an opponent has eight or more cards in their graveyard. {2}, {T}: Target player mills two cards. (They put the top two cards of their library into their graveyard.) Power/Toughness: 6/6"