MArcomage

This is too overpowered to be a common card, it should be at least a non-common...

When you think about cards like vampire countess (or even vampire, which can win the game) then you get too much power in your hand.

This would bring the first time the ability to fill your hand with undead cards and also is a good counter for Cleansening or Holy cards. The problem is that this would take away the big weak spot in Undead Decks so I would add a few changes to make it a little balanced:
Replace non rare cards
-2 stock for each card replaced

better make it " -2 gems/recruits for each card replaced, if insufficient gems or recruits, then rest of hand is replaced with Hidden Treasure and Necromancer "

If you are comparing this Card with "Necropolis", you have to face that this card is even for an uncommon card overpowered. This is caused by two points:
1. Rare Cards won't be discarded. So in this case, you can'T loose that high valuable cards.
2. Necropolis only add 4 uncommons. This Card can add up to 7 uncommon cards (ok, the same amount of commons also), because of this, you can gain cards like Undead Host or Flesh Behemont, which are quite strong Cards in combination with this one.
3.-2 stock. This would mean that you loose up to 14 stock and 10 bricks. But Necropolis costs 13 stock only to be played, even if this is a rare.
All in all is this Card quite good as a rare but in my opinion it shouldn't be ment to be a uncommon or a common.

This card is totally different than necropolis:
1) It gives random cards. Necropolis gives you a great hand.
2) It can't be used in conjunction with Emissary of the afterlife because it doesn't discard Undead cards.

It may be a little overpowered, but balancing issues should probably be addressed by Moj.

It should definetely cost more.

e.g. General's Army (i can't remember the exact name right now so forgive me if it's wrong) gives you a full hand of Soldier cards, +50 (?) recruits, while it's a rare card and needs 20 recruits to be activated. 20 recruits is hard to achieve when you are using up recruits for attacks already.

Also, other than 2-3 good cards, most of the other cards are not that great a hand. And a 30 recruit gain (50-20) is wasted very easily in the first 2-3 rounds.

Still it can grant victory if properly used.

The same goes for this one. Even if it gives you random cards, most Undead cards are attack cards, except a few that give you + stock effects or - stock for the opponent. If I get cards like a Vampire and an Undead Cavalry, I immedietely can inflict at least 50-60 damage to my opponent, which is more than enough to devastate his tower below 10, or completely destroy it. And all that because of 10 bricks and a little patients in waiting for my magic to rise.

Of course such a card will be played in decks that rely on magic (most undead cards are cards that use up gems) and thus will already have a good deal of gems in stock. the -1 stock effect of the card won't affect much the player, especially if he's playing with Mage counter and has a Conjurer and a couple restoration cards in hand.

Therefore imo, a higher cost should apply (e.g. 15 gems, 15 recruits) to the card, which will be in gems and recruits. Also the card should become a Rare card, or at least an uncommon one. A prequisition could allow for this card to give an extra boost in gems (e.g. have a Legend card in hand, or the previous 3 cards played to be Undead)

I agree, it's not as good as Necropolis, but it can still give you great cards, ones that could win the game

I changed this card so feel free to comment.
This is similar (and I think an improvement) to Crypt. Crypt is fairly worthless as is because 1) there are already a lot of undead cards to fill the uncommons, so having a searching card is not needed, and 2) it does very little for you in fetching a card - it could be anywhere from a bone dragon (30g, 10r) or ice revenant (31g, 31r) to a vampire countess (3g), making it too unpredictable to be worth playing.