Time Elemental

Creature — Elemental    (CMC:3)

When Time Elemental attacks or blocks, at end of combat, sacrifice it and it deals 5 damage to you. , : Return target permanent that isn't enchanted to its owner's hand.

53 ME1 • ENAmy Weber

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Oracle Text (click to copy):

10/4/2004
You both sacrifice it and deal the 5 damage at end of combat.
8/1/2005
A "permanent that isn't enchanted" is a permanent with no Auras on it.
9/16/2007
If Time Elemental attacks or blocks, but you no longer control it at end of combat, you can't sacrifice it. However, it will still deal 5 damage to you.