nigelbeans: You wouldn't get any of the 4 legendary decks. You would get 17 characters, missing 7 of them. You'd get 13 expansion packs, missing 3 of them. You also get the Runestone deck, but this can be unlocked through normal game progression.
I hope the above is correct - it's possible I made a mistake.
Thanks for the answer, but then that begs another question which is: what items, exactly, does the customer have to buy in order to get a 100% complete edition, with no missing content whatsoever?