Is Soul of Innistrad legal in Standard, Modern, and Commander?

Soul of Innistrad is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

What type of card is Soul of Innistrad?

Soul of Innistrad is a Creature — Avatar. Its oracle text reads: "Deathtouch {3}{B}{B}: Return up to three target creature cards from your graveyard to your hand. {3}{B}{B}, Exile this card from your graveyard: Return up to three target creature cards from your graveyard to your hand."