Is Rally the Peasants legal in Standard, Modern, and Commander?

Rally the Peasants is legal in: Modern, Legacy, Vintage, Commander, Pauper, Historic.

What type of card is Rally the Peasants?

Rally the Peasants is an Instant. Its oracle text reads: "Creatures you control get +2/+0 until end of turn. Flashback {2}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.) *"If you must go out at night, bring a mob." —Master of the Elgaud Cathars*"