Is Sidar Jabari legal in Standard, Modern, and Commander?

Sidar Jabari is legal in: Legacy, Vintage, Commander.

Sidar Jabari

Q: What type of card is Sidar Jabari?

Sidar Jabari is a Legendary 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.)Whenever Sidar Jabari attacks, tap target creature defending player controls."

Legendary Creature — Human Knight

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)<br>Whenever Sidar Jabari attacks, tap target creature defending player controls.

Set Mirage

Rarity Rare

Artist Gerry Grace