Is Marrow-Gnawer legal in Standard, Modern, and Commander?

Marrow-Gnawer is legal in: Modern, Legacy, Vintage, Commander, Historic.

Marrow-Gnawer

Q: What type of card is Marrow-Gnawer?

Marrow-Gnawer is a Legendary Creature — Rat Rogue. Its oracle text reads: "All Rats have fear. {T}, Sacrifice a Rat: Create X 1/1 black Rat creature tokens, where X is the number of Rats you control. *Marrow-Gnawer united three nezumi gangs when he slew their leaders in a single night. Now they call him their first lord.* Power/Toughness: 2/3"