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Tawnos's Coffin

You may choose not to untap Tawnos's Coffin 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 Tawnos's Coffin 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.

Masters Edition

You may choose not to untap Tawnos's Coffin during your untap step.
{3}, {T}: Remove target creature and all Auras attached to it from the game. Note the number and kind of counters that were on that creature. When Tawnos's Coffin leaves play or becomes untapped, return the removed card to play under its owner's control tapped with the noted number and kind of counters on it, and if you do, return the removed Aura cards to play under their owner's control attached to that permanent.

Antiquities

o3: Select a creature in play; that creature is considered out of play as long as Coffin remains tapped. Hence the creature cannot be the target of spells and cannot receive damage, use special powers, attack, or defend. All counters and enchantments on the creature remain but are also out of play. If Coffin is untapped or removed, creature returns to play tapped. You may choose not to untap Coffin during the untap phase.