The Moment is a rare Legendary Artifact card from Doctor Who (WHO), collector number 459. Current market price: $0.34 (foil $0.61), TCGplayer market prices via Scryfall.
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.