Knightly Valor

Enchant creature
When Knightly Valor enters, 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.

Pioneer Masters

The List

Wilds of Eldraine: Enchanting Tales

Enchant creature
When Knightly Valor enters the battlefield, create a 2/2 white Knight creature token with vigilance.
Enchanted creature gets +2/+2 and has vigilance.

Double Masters 2022

Jumpstart

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.