Is Scholar of Athreos legal in Standard, Modern, and Commander?

Scholar of Athreos is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper.

Scholar of Athreos

Q: What type of card is Scholar of Athreos?

Scholar of Athreos is a Creature — Human Cleric. Its oracle text reads: "{2}{B}: Each opponent loses 1 life. You gain life equal to the life lost this way. *She asks pointed questions of the dead who wait for Athreos, learning of life from those who are about to leave it.* Power/Toughness: 1/4"