Is Twins of Maurer Estate legal in Standard, Modern, and Commander?

Twins of Maurer Estate is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper.

Twins of Maurer Estate

Q: What type of card is Twins of Maurer Estate?

Twins of Maurer Estate is a Creature — Vampire. Its oracle text reads: "Madness {2}{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.) *"Children, where are your parents?" —Reig, wandering monk, last words* Power/Toughness: 3/5"