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

Artificer Class is legal in: Legacy, Vintage, Commander.

Artificer Class

Q: What type of card is Artificer Class?

Artificer Class is an Enchantment — Class. Its oracle text reads: "(Gain the next level as a sorcery to add its ability.) The first artifact spell you cast each turn costs {1} less to cast. {1}{U}: Level 2 When this Class becomes level 2, reveal cards from the top of your library until you reveal an artifact card. Put that card into your hand and the rest on the bottom of your library in a random order. {5}{U}: Level 3 At the beginning of your end step, create a token that's a copy of target artifact you control."

Enchantment — Class

(Gain the next level as a sorcery to add its ability.)

The first artifact spell you cast each turn costs less to cast.

: Level 2

When this Class becomes level 2, reveal cards from the top of your library until you reveal an artifact card. Put that card into your hand and the rest on the bottom of your library in a random order.

: Level 3