Is Chord of Calling legal in Standard, Modern, and Commander?

Chord of Calling is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Chord of Calling?

Chord of Calling is an Instant. Its oracle text reads: "Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.) Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle."