Is Magmatic Sinkhole legal in Standard, Modern, and Commander?

Magmatic Sinkhole is legal in: Modern, Legacy, Vintage, Commander, Pauper.

What type of card is Magmatic Sinkhole?

Magmatic Sinkhole is an Instant. Its oracle text reads: "Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) Magmatic Sinkhole deals 5 damage to target creature or planeswalker. *Opening like the maw of a hellion, the earth swallowed the traveler whole.*"