Is Bitter Reunion legal in Standard, Modern, and Commander?

Bitter Reunion is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

What type of card is Bitter Reunion?

Bitter Reunion is an Enchantment. Its oracle text reads: "When this enchantment enters, you may discard a card. If you do, draw two cards. {1}, Sacrifice this enchantment: Creatures you control gain haste until end of turn. *The peace summit proved the grudge between Urza and Mishra could end only in blood.*"