While I am basically done working on MTG Forge version 1, I wouldn't mind trying to add something to it which would increase its replay value. I know version 1 can get boring and I'm not sure when version 2 will be playable with a few cards. The hard part about asking for suggestions is that most people don't know which features are easy or hard to add, which I completely understand.
My only suggestion is a simple quest mode. You would start out with a basic deck which you would improve by earning money. Basically MTG Forge would look and play the same but you would earn money for each game that you won and you could buy cards and booster packs from a store. This would make the game harder since your cards would be less powerful, say bye-bye to Ancestral Recall and Lightning Bolt.
I can't really think of anything else to suggest that is easy to program. Let me hear your suggestions and what you think about "quest mode".
Did anyone enjoy reading through this article that I typed about Magic's humble beginnings? I thought it was very interesting. The article was written by Magic's creator Richard Garfield.