While we are waiting for C.J. to weigh in on his choice for River Delta, I thought I would let you know that the Deck Library project is up and running. You'll find a Guardians Link in the sidebar called Deck Library. This takes you to a folder in Google Docs where all the decks I could find will be stored in one place for reference. There are some decks up already, so check it out if you get a chance.
The format of each deck lists the deck name, creator, which card sets the deck uses cards from, a card total (which does not include Guardian & Stronghold), Guardian, Stronghold, all cards used in the deck, and a notes/strategy section where the creator explains the purpose of the deck and some of their thoughts.
I have scoured the Yahoo! Groups, old Usenet posts, C.J.'s website, magazine articles, the Guide to the Midrealms, and other sources to build up a large list...the decks posted so far are only the tip of the iceberg. I'll be adding new decks to the folder as I have time. Hopefully in the near future I'll add some Champion's Odyssey decks as well.
NOTE: If a deck was not named, I gave it a name based on the theme. If you are the owner of one of these decks and want the name changed, let me know.
Let me know if you have any suggestions or comments...