The Moment

Mana cost: {2}
Type: Legendary Artifact
Set: Doctor Who #180 (rare)
Price: $0.29 USD

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 has 4 printings, first in Doctor Who (2023). EDHREC ranks it #14,234 among Commander cards. It appears most in The Tenth Doctor // Rose Tyler decks (2,201 on EDHREC). 1 public deck on TCG runs it. It has 11 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: not legal
pioneer: not legal
standard: not legal
brawl: not legal

Public decks that run The Moment

Timey-Wimey - Doctor Who, led by Rose Tyler

Commanders that run The Moment most

Deck counts from EDHREC.

The Tenth Doctor // Rose Tyler: 2,201 decks
Kate Stewart: 256 decks
The Face of Boe: 48 decks
The Fourteenth Doctor: 29 decks
Wilfred Mott: 25 decks
The War Doctor: 23 decks
The Tenth Doctor: 12 decks
Rose Tyler: 7 decks

Often played with The Moment

Cards that show up in the same decks on EDHREC.

Rulings

2023-10-13: Phasing out doesn't cause any "leaves the battlefield" abilities to trigger. Similarly, phasing in won't cause any "enters the battlefield" abilities to trigger.
2023-10-13: If The Moment leaves the battlefield before its first activated ability resolves, the target creature will be untapped, but won't phase out.
2023-10-13: While a permanent is phased out, it's treated as though it doesn't exist. It can't be the target of spells or abilities, its static abilities have no effect on the game, its triggered abilities can't trigger, it can't attack or block, and so on.
2023-10-13: A creature phased out by The Moment doesn't phase in during its controller's untap step as normal. Rather, it phases in immediately after The Moment leaves the battlefield.
2023-10-13: Any continuous effects with a "for as long as" duration ignore phased-out objects. Any such effects will expire if their conditions are no longer met after ignoring the phased-out objects.
2023-10-13: Any one-shot effects that are waiting "until [this] leaves the battlefield," won't happen when a permanent phases out.
2023-10-13: Each Aura and Equipment attached to a permanent that's phasing out also phases out. They will phase in with that permanent and still be attached to it. Similarly, permanents that phase out with counters phase in with those counters.
2023-10-13: Abilities that trigger when a creature becomes tapped won't trigger when the creature phases in tapped.
2023-10-13: The Moment's last ability will destroy itself before you can sacrifice it if there are two or more time counters on it as its last ability resolves. Effects that trigger when you sacrifice a permanent will not trigger when it is destroyed this way.
2023-10-13: Choices made for permanents as they entered the battlefield are remembered when they phase in.
2023-10-13: An attacking or blocking creature that phases out is removed from combat.