Is Darkling Stalker legal in Standard, Modern, and Commander?

Darkling Stalker is legal in: Legacy, Vintage, Commander, Pauper.

What type of card is Darkling Stalker?

Darkling Stalker is a Creature — Shade Spirit. Its oracle text reads: "{B}: Regenerate this creature. {B}: This creature gets +1/+1 until end of turn. *"In this dark place, yes, I *am* afraid of my own shadow." —Mirri of the *Weatherlight** Power/Toughness: 1/1"