Is Ice Floe legal in Standard, Modern, and Commander?

Ice Floe is legal in: Legacy, Vintage, Commander.

What type of card is Ice Floe?

Ice Floe is a Land. Its oracle text reads: "You may choose not to untap Ice Floe during your untap step.{T}: Tap target creature without flying that's attacking you. It doesn't untap during its controller's untap step for as long as Ice Floe remains tapped."

Ice Floe

Land

You may choose not to untap Ice Floe during your untap step.<br>: Tap target creature without flying that's attacking you. It doesn't untap during its controller's untap step for as long as Ice Floe remains tapped.