Yes, they exist to make Xykon tougher. Also note that they might have an effect if you try to use an Area Effect shtick on Xykon, such as trying to Fireball him when he has a minion with Bloodlust right under him.
Yes, you can get assistance, or use any other non-Battle Shtick that adds to your Attack or Defense (such as Elan's Conscience Devil/Angel cards). But, as mentioned, the best result you can ever get without a Battle Shtick is a draw.
Discard and draw another.