Is Leonardo, Leader in Blue legal in Standard, Modern, and Commander?

Leonardo, Leader in Blue is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Leonardo, Leader in Blue

Q: What type of card is Leonardo, Leader in Blue?

Leonardo, Leader in Blue is a Legendary Creature — Mutant Ninja Turtle. Its oracle text reads: "Sneak {3}{W}{W} (You may cast this spell for {3}{W}{W} if you also return an unblocked attacker you control to hand during the declare blockers step. He enters tapped and attacking.) When Leonardo enters, if his sneak cost was paid, creatures you control get +2/+0 until end of turn. {1}{W}: Leonardo gains first strike until end of turn."

Legendary Creature — Mutant Ninja Turtle

Sneak (You may cast this spell for if you also return an unblocked attacker you control to hand during the declare blockers step. He enters tapped and attacking.)