I'm happy to announce there is a new version of MTG Forge with 1304 cards. All of the credit goes to DennisBergkamp and others who have contributed. There are even a couple of really new Conflux cards that surprised me like Nicol Bolas, Planeswalker and Child of Alara.
On a side note I had a great time creating a rat deck and a solider deck. It was nice that MTG Forge had enough cards to support decks that featured rats and soliders. You can download and post your decks on the forums. And don't worry, I'm still working on the quest mode.
Download MTG Forge
(Link updated - it was the 02/26 version and now it is the 02/27 version which is the very latest.)