Is Tower Worker legal in Standard, Modern, and Commander?

Tower Worker is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

Tower Worker

Q: What type of card is Tower Worker?

Tower Worker is an Artifact Creature — Assembly-Worker. Its oracle text reads: "Reach {T}: Add {C}. If you control creatures named Mine Worker and Power Plant Worker, add {C}{C}{C} instead. *Even Urza's most mundane creations shared his obsession with perfection.* Power/Toughness: 1/3"