Artifact
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The effect doesn’t care what types the card has after it is exiled, only that it have been a creature while on the battlefield.
If the targeted creature is a token, it will cease to exist after being exiled. Any Auras that were attached to it will remain exiled forever.
If the exiled card is returned to the battlefield and, for some reason, it now can’t be enchanted by an Aura that was also exiled by Tawnos’s Coffin, that Aura will remain exiled.
If Tawnos’s Coffin leaves the battlefield before its ability has resolved, it will exile the targeted creature forever, since its delayed triggered ability will never trigger.
The creature returns to the battlefield tapped. It does not return to the battlefield and then tap afterwards.
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: Exile target creature and all Auras attached to it. Note the number and kind of counters that were on that creature. When this artifact 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.