Is Phyrexian Gremlins legal in Standard, Modern, and Commander?

Phyrexian Gremlins is legal in: Legacy, Vintage, Commander, Pauper.

What type of card is Phyrexian Gremlins?

Phyrexian Gremlins is a Creature — Phyrexian Gremlin. Its oracle text reads: "You may choose not to untap Phyrexian Gremlins during your untap step.{T}: Tap target artifact. It doesn't untap during its controller's untap step for as long as Phyrexian Gremlins remains tapped."

Phyrexian Gremlins

Creature — Phyrexian Gremlin

You may choose not to untap Phyrexian Gremlins during your untap step.<br>: Tap target artifact. It doesn't untap during its controller's untap step for as long as Phyrexian Gremlins remains tapped.