Is Nemesis Mask legal in Standard, Modern, and Commander?

Nemesis Mask is legal in: Modern, Legacy, Vintage, Commander.

What type of card is Nemesis Mask?

Nemesis Mask is an Artifact — Equipment. Its oracle text reads: "All creatures able to block equipped creature do so. Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery. This card enters unattached and stays on the battlefield if the creature leaves.)"

Nemesis Mask

Artifact — Equipment

All creatures able to block equipped creature do so.

Equip (: Attach to target creature you control. Equip only as a sorcery. This card enters unattached and stays on the battlefield if the creature leaves.)

Set Darksteel

Rarity Uncommon

Mana Value 3

Artist Adam Rex

Collector # 134

Scryfall