MArcomage

Koschei the Deathless (Legend) (Durable)
Cost: 15 Recruits
Attack: 19

Four Horsemen of the Apocalypse (Legend)
Cost: 14 All
Mode 1: Attack 30
Mode 2: Enemy Stock -14
Mode 3: Enemy discards 5 cards at random
Mode 4: Halves both players Tower, Wall, and Stock

Edit: Raised attack from 20 to 30

42 resources to attack for only 20? Shouldn't Mode 1 have a little more kick to it?

Frozen fire (4G 4R) Common
Burning
If last played card was Burning
Return half the cost

Tribal luck (common)
Cost: free
If your last card had a "tribal" keyword (brigand, alliance, holy...) you get the hidden ability of that keyword.

I can't explain it better so I show you an example:
If you use tribal luck after an alliance card you will get production X2

Hidden ability is not the apropiate term indeed. Id go for... Triggered ability of the keyword?

Suggestions of my own (In new keyword Aquatic)

Mermaid (5R, Aquatic)
Enemy tower & wall & stock -2

Dike (3B, Aquatic)
Wall +N
Tower +N/2
N= #Aquatic

Whale (10/10/10, Aquatic)
Enemy tower, wall, stock -10

Seaquake (6G, Aquatic)
Players loose N tower, wall, stock
N= #Aquatic

Naga (15G 5R, Aquatic)
Wall -3N
Tower-2N
Stock-3N
N=#Aquatic

Sunken statue (4B,4R Aquatic, Unliving)
Stock +N
N= #Unliving + #Aquatic

Sea serpent (5G 5R Aquatic)
If enemy wall = 0
Stock -7
Else
Enemy tower, wall, stock -3

Poseidon (25G aquatic)
Player with lowest wall
Tower, wall, stock -15

Triggered effect of keyword: Enemy tower, wall, stock -1,2,3 (c,u,r)

Well, didn't mention rarity, but for most cards it's obvious. Surely it coud use ballancing.

Cloning (uncommon, illusion)
Cost: 15G

Select a card from hand, the rest is discarded. Next cards will be the card you have choosen.

That might be to good for uncommon.
Imagine it being played on Mage while having a tremendous amount of gems.
(Could be fun to play it on Militia :-P)
Do like the idea.

Let's bake one of mine...
Uhm...
Ah!
Concealing wall 4B Common
If #tower - #wall < 21
Tower -5
Wall +16
Else
wall +6

Which should 'hide' you're tower behind your wall.

A cloned Banshee or Titan's Right Arm would be interesting indeed, assuming you have the stock to run with it.

cloning looks way too powerfull

imagine a card like pegasus being cloned.... thats 8 damage minimun + 40 gems right there.... and thats if opponement has a wall

i still like the idea but seems overpowered

i think a better version is:

Cloning (Illusion) (uncommon)
Cost 11 gems and 5 recruits
Select a card.
Every "no keyword" cards is replaced by that card

Strategist (Uncommon)
Cost: 5/5/5
Durable, Quick
Select a card to be discarded

i love that one endovior

i mean, its far from being overpowered, paying 15 ress just to discard a card is costly, but its a card i might consider....

Exploration (Common)
Cost: 0
Production x0
Next card will not be a common card.

Vengeance (Uncommon)
Cost: 5/5/5
Attack 10
If enemy damaged your wall last turn, Attack +10
If enemy damaged your tower last turn, Attack +10

Reversal (Rare)
Cost: Equal to cost of opponent's last card.
Same effect as opponent's last card.

I'm not sure Reversal could be programmed as it stands with a variable cost. It could reduce resources by those amounts, I'd assume, but I doubt it could make such a check for the ability to play it.

I like Vengeance. Seeing it in your opponent's hand, do you attack or don't you?

Wheels Within Wheels (Rare)
Cost: 25/25/25
Durable
Stock +10
Enemy Stock -10
If last card played was Wheels Within Wheels, increase own lowest facility by 1 and decrease enemy's highest facility by 1.

Hurricane (Rare)
Cost: 10/10/10
Quick
Replace all cards in the game with Wind.

Rocks 'n' Stones (common)
Cost: 1 brick
If you have balistae or catapult in your hand, enemy tower -4;
else bricks +4.

Bribe (15 G)
(Brigand, rare)
Swap Facility's of your with opponent
Mode 1 Quarry
Mode 2 Magic
Mode 3 Dungeon

i love the bribe card
hurricane is interesting

here is an idea of mine:

Day of the dead
Common (Undead)
cost 6/6/6
Select a card from hand, it will be replaced by day of the dead
Ennemy will have his card from the matching position replaced by day of the dead
Next card will be a common card from your deck

Cockatrice (rare)(beast)
Cost: 25 recruits
Turn all enemy's recruits into bricks for you

Thieves guild
Common, 5B 2R
Tower +3
Enemy stock -1
Next card will be a Brigand card