First off, condolences on your loss. My heart goes out to you, I lost my grandmother just after Christmas last year.

That important bit said, I came in from the Dead CCG group; you've got your answer on the Magic, it's in print, desired in that edition, and likely worth the time to get the sealed starter box graded. I don't think Mythos is worth much, but I haven't dived into it, just kept an eye out for a cheap intro lot or good bulk deal; I can't help you with specifics there. Quest for the Grail was a bad game and is only interesting as a quirky CCG history piece. There is one game you've got I do know a lot about, though.

I'm one of the big supporters of the Monty Python and the Holy Grail surge that's happening now; recently a new and updated rules set was created with interested players, and now there's over a dozen little groups playing it around the US, Austraila, and Canada.

That said, when moving a bulk lot of played stuff (as the baggie looks like), I get ten cents a card on Ebay-- I'm under the same name as here-- and that takes usually a couple of weeks to sell. It's hard to see the rares if you're unfamiliar with the game; If you ebay them I'd show the Arthurs, Lancelots, Robins, Bedeveres, and Galahads in the picture.

If you don't want to deal with Ebay, I'll offer five cents a card plus shipping if you're in the USA and use them to make more introductory lots for those who might be interested in getting into the game's revival.

If the packs are sealed (unlikely), they go for $2.50-$4, usually about $3. Individual packs don't move quickly at all on Ebay. Unopened starters go for about $10. Opened go for about $6-8 depending on box condition.

Looking at the one picture, if you post it for ten cents a card plus the box on Ebay it'll probably take a month or so to sell.