Cave (Action, cost $6)
+1 Card
+1 Action
+ $1
Gain a Cave
This looks swingy and unfun. The first person who happens to get $6 has a huge advantage.
Cleric (Action-Reserve, cost $4)
Put this on your Tavern Mat.
You may trash a card from your hand.
-
When you trash a card, you may call this, for +2%
It's hard to think of a situation in which this is different from just "You may trash a card for 2 VP." The vast, vast majority of the time you'll be calling it in reaction to itself.
Comrades (Action, cost 6 debt)
+1 Action
Counting this, if you have:
2 or more Comrades in play,
+1 Card, and +1 Action.
3 or more Comrades in play,
+1 Buy, + $1
4 or more Comrades in play, you may trash a Comrades from play, for +3VP
This is a neat idea, but this implementation is incredibly weak. Playing 2 gives the combined effect of just a Necropolis, because you had to play a Ruined Village first. The Market and trash effects are good if you actually get to them, but even then it's way overpriced at 6 Debt.
Desert (Victory, cost $5)
This is worth 6VP -1VP per token on the Desert Mat.
-
Setup: put 6 tokens on the Desert pile. When you gain this, move a token from the Desert pile to the Desert Mat.
If you think about it, there's almost no reason to ever get this. If you get one, your opponent will immediately want to get one just to take those points away from you. The same thing will happen if you get another after that, until they're all worth nothing.
Dice (Treasure, cost: $2)
3 Debt
Gain a silver to your hand.
Silver-gaining is one of the weakest abilities in Dominion, and the gain-to-hand thing doesn't make it much better. Note that Squire is a $2 that gives you Silver in addition to other options, and it actually gives you +$1 instead of Debt.
Executioner (Action, cost $5)
+1 Action
You may trash this or a Criminal from the supply.
-
When you trash this, +1 Card.
Criminal
When you trash this, +3 Cards.
I am super confused. Is this a split pile with Executioner on top? Did you mean to say you can't buy
criminal? If you can't buy it, it shouldn't be in the supply.
Gemstone (Treasure, cost $5*)
$1
+1 Coffers
-
*This costs $1 less per Silver you have in play, but not less than $0.
This is likely on the weak side, but you have the utterly abysmal Royal Seal to compare it to, so it's probably fine.
Misfortune (Action-Curse, cost $2)
Put this into the discard pile of the player to your left.
-
-1VP
I'm not seeing any reason to ever buy this. It could end up in your deck at the end, for all you know.
Outlaw (Action, cost $4)
+1 Card
+1 Action
Trash an Outlaw from the supply.
-
When you trash this, +1 Card.
On first glance, I like it. It could probably be $3, since I'm thinking it will run out of power pretty fast.
Pickpocket (Action-Attack, cost $2)
+1 Card
+1 Action
Each other player discards down to 4 cards in hand.
This is exactly the same as Urchin, but cheaper and without the ability to turn into a Mercenary. It doesn't seem to add anything new.
Terminal (Cost $5, Action)
+1 Action
You may play an Action card from your hand.
This is basically the same as Necropolis, a $1 card.
Trench (Action-Victory-Reaction, cost $3)
Put this on top of your deck.
-
2%
-
When another player plays an Attack card, you may reveal this from your hand, to be unaffected by it.
This is kind of interesting in that you have to choose between clogging your next hand with a dead card or leaving yourself vulnerable, but the fact that it shuts down attacks so completely will often mean there's no point buying the attacks, so then there's no point buying this.
Wagon Wheel (Action, cost $2)
You may play an action card from your hand three times. If you did, when you discard this from play, put this and the tripled Action into the discard pile of the player to your left.
This has the same problem as Misfortune. Your opponent will get just as much benefit as you do (they'll get more, actually, because they'll get the Wagon Wheel
and another of your cards) so there's little point in getting it.
You have some decent ideas here, but I'd encourage you to look carefully at the prices of existing cards for comparison with yours. Also, try to think through what would actually happen if your cards were in the kingdom.
Also, if your cards have images, they're not showing up when you click the links. Investment and Landfill are missing prices on this page, and Gold Pan's link is broken.