Is Skirsdag Flayer legal in Standard, Modern, and Commander?

Skirsdag Flayer is legal in: Modern, Legacy, Vintage, Commander.

Skirsdag Flayer

Q: What type of card is Skirsdag Flayer?

Skirsdag Flayer is a Creature — Human Cleric. Its oracle text reads: "{3}{B}, {T}, Sacrifice a Human: Destroy target creature. *Certain initiates into the Skirsdag cult take a vow of blindness, pledging obedience to none but demonkind.* Power/Toughness: 1/1"