My two brothers and I just played a game before which we decided to each choose a card we came up with to play with and choose the other 7 at random. So, the kingdom was: Menagerie, Fishing Village, Horse Traders, Jester, Trading Post, Hunting Party, Philosopher's stone and our three creations; Trade Agreement, Road Block, and Fund.
Here are the cards:
Trade Agreement
$4 Action
+$2
+1 Buy
The player to your left reveals their hand. Choose one of the revealed cards and move the Trade Token to that card’s supply pile. While the Trade Token remains on that pile, all cards from that pile cost 1 less, but not less than 0.
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Setup: Place the Trade Token on the Provinces pile.
This was my idea, and it was a little weak. It's main value to me was for the +$2 in my Menagerie deck which liked the extra name. I think to play with it again, I would make the moving of the Trade Token optional, or not restrict it based on the hand of the player to the left. The token never really moved where I wanted it to. Another idea I might consider would be to make an opposite card, which makes everything cost $1 more.
Road Block
$4 - Action
+1 Card
+1 Action
Place a road block token on any supply pile without a road block token. When you gain a card from a pile with a road block token set it aside. After you next reshuffle, put it in your discard pile.
This was one of my brothers' creations, and he made it his quest to Road Block everything except the victory cards. It really didn't do much, because you just bought blocked cards you needed if you needed them. However, I would like to try a few things with it. I would make it a one shot, or make it do something for your deck, or maybe be +1 Card, +1 Action, You may trash a card from your hand. If you do ..... Any of these might make it more interesting. I would also like to try playing with it in a game with some brutal attacks like Ghost Ship to see if it helps slow the game down more.
The card also had a weird issue with cards which gain things to places other than your discard pile. My brother wanted gaining to hand or gaining to top of deck to override Road Block, but I'm not sure how to word that. I think that the road block should still delay them, but then place them in your discard pile anyways. Thoughts?
Fund
$6 - Treasure-Duration
Now and at the start of your next buy phase, $2.
This was probably the best card we tried, although it might be a little powerful. The brother who came up with this played a strategy based on Hunting Party and this card, and had at least $4 from these guys basically every turn.
So, any thoughts?