Is Femeref Knight legal in Standard, Modern, and Commander?

Femeref Knight is legal in: Legacy, Vintage, Commander, Pauper.

Femeref Knight

Q: What type of card is Femeref Knight?

Femeref Knight is a Creature — Human Knight. Its oracle text reads: "Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.){W}: Femeref Knight gains vigilance until end of turn."

Creature — Human Knight

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)<br>: Femeref Knight gains vigilance until end of turn.

Set Mirage

Rarity Common

Artist Tony Roberts