Timing will be critical when playing this card
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
So I avoided cards with casting costs involving two of a single color where I could (though Bruna, Light of Alabaster and Yomiji, Who Bars the Way were just too good not to include and I adjusted my mana to compensate)
The path to the former is well-worn in the format, paved with cards like Traumatize, Maddening Cacophony, and Cut Your Losses
10: Jason Chan ( Jason Chan has worked on some of Magics most powerful cards in recent times such as Avacyn, Angel of Hope and Jace, the Mind Sculptor as well as cards like both versions of Xenagos and Deicide above
All decks are the same, so if you draw a card, there is a good chance that your opponents will have the same card in hand at some point