Is Chronatog Totem legal in Standard, Modern, and Commander?

Chronatog Totem is legal in: Modern, Legacy, Vintage, Commander.

What type of card is Chronatog Totem?

Chronatog Totem is an Artifact. Its oracle text reads: "{T}: Add {U}. {1}{U}: This artifact becomes a 1/2 blue Atog artifact creature until end of turn. {0}: This creature gets +3/+3 until end of turn. You skip your next turn. Activate only once each turn and only if this permanent is a creature."