Is Rotating Fireplace legal in Standard, Modern, and Commander?

Rotating Fireplace is legal in: Legacy, Vintage, Commander.

What type of card is Rotating Fireplace?

Rotating Fireplace is an Artifact. Its oracle text reads: "This artifact enters tapped with a time counter on it. {T}: Add an amount of {C} equal to the number of time counters on this artifact. {4}, {T}: Time travel. Activate only as a sorcery. (For each suspended card you own and each permanent you control with a time counter on it, you may add or remove a time counter.)"

Rotating Fireplace

Artifact

This artifact enters tapped with a time counter on it.

: Add an amount of equal to the number of time counters on this artifact.

, : Time travel. Activate only as a sorcery. (For each suspended card you own and each permanent you control with a time counter on it, you may add or remove a time counter.)