(define Ω (let ([w (lambda (f) (f f))]) (w w)))

This is hilarious and awesome. (And therefore, so are you. :-) ).

There are a couple of random typos on the cards you might want to check before printing (I don't mind copyediting if you want to send them over when they're reasonably final); I don't have the Dominion experience to comment on the actual content. The cards look really pretty, though :-).