Pugs are like little people in fur coats.
If it's not a Pug, it's just a dog.
Just to clear up: Yes
If I use Circle of Kayless to gain the ability of the card that has a pre-requisite, can I use that ability if I have met the requirements?
If the requirement is to have played a blue card, can I count Circle of Kayless as the blue card? No
If the ability on the card grants additional Attack or Recruit points (such as Xander's card that adds the value of the Light to the damage), do I gain these (assuming I meet any pre-requisites for the ability)?Yes
Pretend the text in the box of the card you're targeting is actually in the box on the Circle of Kayless.