Is Bard Class legal in Standard, Modern, and Commander?

Bard Class is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Bard Class?

Bard Class is an Enchantment — Class. Its oracle text reads: "(Gain the next level as a sorcery to add its ability.) Legendary creatures you control enter with an additional +1/+1 counter on them. {R}{G}: Level 2 Legendary spells you cast cost {R}{G} less to cast. This effect reduces only the amount of colored mana you pay. {3}{R}{G}: Level 3 Whenever you cast a legendary spell, exile the top two cards of your library. You may play them this turn."