Oubliette
{1}{B}{B}
Enchantment
When ~this~ enters, target creature phases out until ~this~ 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.)
Tawnos's Coffin
{4}
Artifact
You may choose not to untap ~this~ during your untap step.
{3}, {T}: Exile target creature and all Auras attached to it. Note the number and kind of counters that were on that creature. When ~this~ leaves the battlefield or becomes untapped, return that exiled card to the battlefield under its owner's control tapped with the noted number and kind of counters on it. If you do, return the other exiled cards to the battlefield under their owner's control attached to that permanent.