Don't know what that one card would be...
Does the "Big One" make any sense without the context of the rest of your collection? Do you want the Halla because it's a beautiful object on its own, or because it completes your 1911 Zeenuts? If you don't have any other Zeenuts, what would you do with the Halla?
On the other hand, (yes, I am a trained economist) I think I would be tempted to make the trade. I could consider my former cards as my very enjoyable way of saving up for the "Big One." And, as in the set-for-a-Plank trade, you can always begin "saving up" again. I suppose that if your trade bait contained items that were just as hard to find as your Grail, you might not ever have the chance to replace them at any price. Nevertheless, it's worth considering.
Bill
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