Why not give Luke a card that ties him - thematically - with Obi-wan, his mentor of sorts.

IWNFY is just such a messy card to begin with. Maybe some sort of 'Force balance' ala Obi. Or something to represent his dark tendencies, give him a Vader type card.

Or change it,

I will not fight you:
D4
Any unblocked damage is dealt to the attacker instead of Luke.

OR

I will not fight you:
Luke and his opponent discard all cards with an attack value greater than one.
Draw 3 cards.