Is Worthy Cause legal in Standard, Modern, and Commander?

Worthy Cause is legal in: Legacy, Vintage, Commander.

Worthy Cause

Q: What type of card is Worthy Cause?

Worthy Cause is an Instant. Its oracle text reads: "Buyback {2} (You may pay an additional {2} as you cast this spell. If you do, put this card into your hand as it resolves.) As an additional cost to cast this spell, sacrifice a creature. You gain life equal to the sacrificed creature's toughness."