Is Sibsig Muckdraggers legal in Standard, Modern, and Commander?

Sibsig Muckdraggers is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

What type of card is Sibsig Muckdraggers?

Sibsig Muckdraggers is a Creature — Zombie. Its oracle text reads: "Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) When this creature enters, return target creature card from your graveyard to your hand. Power/Toughness: 3/6"