Is Blazing Sunsteel legal in Standard, Modern, and Commander?

Blazing Sunsteel is legal in: Legacy, Vintage, Commander.

Blazing Sunsteel

Q: What type of card is Blazing Sunsteel?

Blazing Sunsteel is an Artifact — Equipment. Its oracle text reads: "Equipped creature gets +1/+0 for each opponent you have. Whenever equipped creature is dealt damage, it deals that much damage to any target. Equip {4} *Wyleth emerged from the crater unscathed with the sun's fury trapped in his hands.*"