Oubliette

Mana cost: {1}{B}{B}
Type: Enchantment
Set: Double Masters #100 (uncommon)
Price: $2.55 USD

When this enchantment enters, target creature phases out until this enchantment leaves the battlefield. Tap that creature as it phases in this way. (Auras and Equipment phase out with it. While permanents are phased out, they're treated as though they don't exist.)

Oubliette has 6 printings, first in Arabian Nights (1993). EDHREC ranks it #3,966 among Commander cards. It appears most in Zur the Enchanter decks (1,771 on EDHREC). 1 public deck on TCG runs it. It has 9 official rulings.

Legality

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

Public decks that run Oubliette

Odds and Ends - Secret Lair Commander, led by Yennett, Cryptic Sovereign

Commanders that run Oubliette most

Deck counts from EDHREC.

Often played with Oubliette

Cards that show up in the same decks on EDHREC.

Rulings

2020-08-07: If Oubliette leaves the battlefield before its triggered ability resolves, the target creature won't be phased out or tapped.
2020-08-07: Abilities that trigger when a creature becomes tapped won't trigger when the creature phases in tapped.
2020-08-07: Choices made for permanents as they entered the battlefield are remembered when they phase in.
2020-08-07: Any one-shot effects that are waiting “until [this] leaves the battlefield,” such as that of Kitesail Freebooter, won't happen when a permanent phases out.
2020-08-07: 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.
2020-08-07: A creature phased out by Oubliette doesn't phase in during its controller's untap step as normal. Rather, it phases in immediately after Oubliette leaves the battlefield.
2020-08-07: 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.
2020-08-07: 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.
2020-08-07: Any continuous effects with a “for as long as” duration such as that of Awakener Druid ignore phased-out objects. Any such effects will expire if their conditions are no longer met after ignoring the phased-out objects.