Is Ring of Xathrid legal in Standard, Modern, and Commander?

Ring of Xathrid is legal in: Modern, Legacy, Vintage, Commander.

Ring of Xathrid

Q: What type of card is Ring of Xathrid?

Ring of Xathrid is an Artifact — Equipment. Its oracle text reads: "{2}: Regenerate equipped creature. (The next time that creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.) At the beginning of your upkeep, put a +1/+1 counter on equipped creature if it's black. Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)"

Artifact — Equipment

: Regenerate equipped creature. (The next time that creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

At the beginning of your upkeep, put a +1/+1 counter on equipped creature if it's black.

Equip (: Attach to target creature you control. Equip only as a sorcery.)