So my Dominion: Decadence expansion was a flop, mostly because the idea of a +3 Cards, +1 Action Spoils had already been done, and my idea of adding them to your deck whenever you want and then trashing them after play wasn't enough to make it interesting.
So, I've come up with an idea that I think is more original: Use Tokens. The basic idea is that you get a Use Token when you discard a card from play. This allows the following card concepts:
Compatriot
Action - $4
+2 Cards
You may pay a Use Token to return this to your hand.
When you discard this from play, take a Use Token.
Terminal draw you can play multiple times per turn - if you have the actions for it.
Commercial Hub
Action - $4
+1 Action per Use Token you have.
During cleanup, you may put this on your deck. When you discard this from play, take a Use Token.
If you have a lot of Tokens, you can top deck this and then start your next turn with a whole bunch of actions. However, you DON'T get another Token if you top deck it - but discarding it is a gamble, since no matter how many actions it gives, it won't be useful if it's on the bottom of your deck.
I'll think of some more ideas later. For now, what do you think of this idea and these cards?