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

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

What type of card is Everglove Courier?

Everglove Courier is a Creature — Elf. Its oracle text reads: "You may choose not to untap this creature during your untap step. {2}{G}, {T}: Target Elf creature gets +2/+2 and has trample for as long as this creature remains tapped. Power/Toughness: 2/1"