Is Leonardo's Technique legal in Standard, Modern, and Commander?

Leonardo's Technique is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Leonardo's Technique

Q: What type of card is Leonardo's Technique?

Leonardo's Technique is a Sorcery. Its oracle text reads: "Sneak {1}{W} (You may cast this spell for {1}{W} if you also return an unblocked attacker you control to hand during the declare blockers step.) Return one or two target creature cards each with mana value 3 or less from your graveyard to the battlefield."