Is Willow Satyr legal in Standard, Modern, and Commander?

Willow Satyr is legal in: Legacy, Vintage, Commander.

What type of card is Willow Satyr?

Willow Satyr is a Creature — Satyr. Its oracle text reads: "You may choose not to untap Willow Satyr during your untap step.{T}: Gain control of target legendary creature for as long as you control Willow Satyr and Willow Satyr remains tapped."

Willow Satyr

Creature — Satyr

You may choose not to untap Willow Satyr during your untap step.<br>: Gain control of target legendary creature for as long as you control Willow Satyr and Willow Satyr remains tapped.