Is Fleeting Memories legal in Standard, Modern, and Commander?

Fleeting Memories is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Fleeting Memories?

Fleeting Memories is an Enchantment. Its oracle text reads: "When this enchantment enters, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.") Whenever you sacrifice a Clue, target player mills three cards."