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Vigilance
Whenever an artifact or creature enters the battlefield untapped and under an opponent's control, they may tap that permanent. If they don't, you create a 1/1 white Vampire creature token with lifelink.
If the permanent is tapped as the ability resolves, the opponent can't choose to tap it, so you'll create a Vampire token. Similarly, if it's no longer on the battlefield as the ability resolves, they can't choose to tap it, and you'll create a Vampire token.
