Is Searing Spear Askari legal in Standard, Modern, and Commander?

Searing Spear Askari is legal in: Legacy, Vintage, Commander, Pauper.

Searing Spear Askari

Q: What type of card is Searing Spear Askari?

Searing Spear Askari 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.){1}{R}: Searing Spear Askari gains menace until end of turn. (It can't be blocked except by two or more creatures.)"

Creature — Human Knight

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)<br>: Searing Spear Askari gains menace until end of turn. (It can't be blocked except by two or more creatures.)