Is The Moment legal in Standard, Modern, and Commander?

The Moment is legal in: Legacy, Vintage, Commander.

What type of card is The Moment?

The Moment is a Legendary Artifact. Its oracle text reads: "At the beginning of your upkeep, put a time counter on The Moment. {2}, {T}: Untap target creature you control. It phases out until The Moment leaves the battlefield. {3}, {T}: Destroy each nonland permanent with mana value less than or equal to the number of time counters on The Moment. Then sacrifice The Moment. Activate only as a sorcery."

The Moment

Legendary Artifact

At the beginning of your upkeep, put a time counter on The Moment.

, : Untap target creature you control. It phases out until The Moment leaves the battlefield.

, : Destroy each nonland permanent with mana value less than or equal to the number of time counters on The Moment. Then sacrifice The Moment. Activate only as a sorcery.