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Enchant creature
When Knightly Valor enters the battlefield, create a 2/2 white Knight creature token with vigilance. (Attacking doesn't cause it to tap.)
Enchanted creature gets +2/+2 and has vigilance.
If the creature this Aura would enchant is an illegal target by the time Knightly Valor tries to resolve, the Aura spell doesn’t resolve. It won’t enter the battlefield, so its ability won’t trigger.
You need a creature for Knightly Valor to target as you cast it. There’s no way to have it enter the battlefield attached to the Knight token it’ll create.
