It is definitely possible to "complete" this game, but I don't advise it. I have everything except the lieutenant packs. In my opinion, the lieutenant packs add so little to the gameplay that they're not worth it- however, I happen to be one of those people who couldn't care less if I'm using a token or a miniature to represent a lieutenant.
I will dare not agree with big Z . plot decks when wisely chosen and timely played add some deathly possibilities to the Overlord, The point is to not overflow your heroes with tokens. At the beginning i didn't see any interest to buy them but now i wouldn t be able to by pass them.
Certainly, they do. My point is that the number of plot decks far outweighs your ability to use them. Consider that if you started a full campaign once every month and selected and purchased your ideal plot deck just before beginning each campaign, after two years you still wouldn't have all the packs (even if your ideal choice was different every time .)