Is Ghosthelm Courier legal in Standard, Modern, and Commander?

Ghosthelm Courier is legal in: Legacy, Vintage, Commander.

What type of card is Ghosthelm Courier?

Ghosthelm Courier is a Creature — Human Wizard. Its oracle text reads: "You may choose not to untap this creature during your untap step. {2}{U}, {T}: Target Wizard creature gets +2/+2 and has shroud for as long as this creature remains tapped. (It can't be the target of spells or abilities.)"