Cavalier of Dawn
Creature — Elemental Knight
Oracle Text
Vigilance When this creature enters, destroy up to one target nonland permanent. Its controller creates a 3/3 colorless Golem artifact creature token. When this creature dies, return target artifact or enchantment card from your graveyard to your hand.Rules for this card
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A keyword ability that lets a creature attack without tapping. See rule 702.20, “Vigilance.”
Rulings (1)
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Wizards of the CoastYou may put this creature’s enters ability onto the stack without choosing any target. It will resolve with no effect. However, if you do choose a target and the target permanent is an illegal target by the time that ability tries to resolve, the ability won’t resolve. No player will create a Golem token. If the target is legal but not destroyed (most likely because it has indestructible), its controller will create a Golem token.