Is Grave Scrabbler legal in Standard, Modern, and Commander?

Grave Scrabbler is legal in: Modern, Legacy, Vintage, Commander, Pauper.

Grave Scrabbler

Q: What type of card is Grave Scrabbler?

Grave Scrabbler is a Creature — Zombie. Its oracle text reads: "Madness {1}{B} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.) When this creature enters, if its madness cost was paid, you may return target creature card from a graveyard to its owner's hand."