Cool, great idea! I love Sporcle. I noticed some omissions too, in addition to ftl's:
Inn has only 3 letters in its name
"Action card costing more than $2 that changes the number of cards it gives conditionally" is perhaps poorly worded, but things like Scout, Apothecary, Cellar, Library came to mind. And even Hunting Party gives +1 or +2 cards depending on whether you have non-duplicates still in your deck. Or Tournament depending on whether the other person has a Province. Also, Menagerie.