Is March of Wretched Sorrow legal in Standard, Modern, and Commander?

March of Wretched Sorrow is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is March of Wretched Sorrow?

March of Wretched Sorrow is an Instant. Its oracle text reads: "As an additional cost to cast this spell, you may exile any number of black cards from your hand. This spell costs {2} less to cast for each card exiled this way. March of Wretched Sorrow deals X damage to target creature or planeswalker and you gain X life."

March of Wretched Sorrow

Instant

As an additional cost to cast this spell, you may exile any number of black cards from your hand. This spell costs less to cast for each card exiled this way.