Voltaic key

[Juggalonoke]

If I was to use a voltaic key to untap an oppoentents creature before combat damage would that basically negate the attack or would I have just given it vigalence?

[JaCe BeLeReN]

{Voltaic Key}
It would have to be an artifact creature to be able to tap it, and you do not negate the attack. You just gave it vigilance like you said.

[scarsabrex]

basically yes