Is Donatello, Gadget Master legal in Standard, Modern, and Commander?

Donatello, Gadget Master is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Donatello, Gadget Master

Q: What type of card is Donatello, Gadget Master?

Donatello, Gadget Master is a Legendary Creature — Mutant Ninja Turtle. Its oracle text reads: "Sneak {1}{U} (You may cast this spell for {1}{U} if you also return an unblocked attacker you control to hand during the declare blockers step. He enters tapped and attacking.) Whenever Donatello deals combat damage to a player, create a token that's a copy of target artifact you control."

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.)