Is Benalish Cavalry legal in Standard, Modern, and Commander?

Benalish Cavalry is legal in: Modern, Legacy, Vintage, Commander, Pauper.

Benalish Cavalry

Q: What type of card is Benalish Cavalry?

Benalish Cavalry 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.) *"My people swore to protect Benalia to the end. It is battered, but yet stands, as do we."* Power/Toughness: 2/2"