I don't want to critique all the cards, but I chose the ones I like or stood out to me… still a lot of them…
Field
Types: Action
Cost: $4
Reveal the top 4 cards of your deck. Put one of each differently named card revealed into your hand. Discard the rest.
I know there are a lot of terminal draw cards, but I really like how simple and thematic this is. Come to think of it, Cornucopia doesn't have a terminal draw (outside Followers, which I don't count), so this could easily be a worthy addition.
Storyteller
Types: Action
Cost: $4
+1 Card. If this is the first time you played a Storyteller this turn, +1 Action.
While this is in play, when you play an Action card that you don't already have a copy of in play, +1 Action.
Clarification: The first Storyteller you play only gives you +1 Action, not +2 Actions, because it wasn't in play when you played it.
I like LFN's idea of simply making it a cantrip itself. Certainly makes it easier. Plus 2nd Storyteller just plain sucks if it is a terminal +1 Card. I really like the idea though! One of my favorites.
Scarecrow
Types: Action
Cost: $3
+2 Cards. +2 Actions. Reveal your hand. Discard duplicate cards one at a time until you have no duplicate cards in hand.
Other than paring it with Menagerie, I don't really see a situation where this shines. Someone please enlighten me.
Ingot
Types: Treasure
Cost: $5
Worth $2. +1 Buy. If you have at least 4 differently-named Treasures in play (including this), +$2.
I know there were a lot of $4 treasure ideas in the Prosperity contest, which I still think is a good idea. This one fits in well with Cornucopia's theme. (See other note on Sharpening Stone)
Vanguard
Types: Action
Cost: $5
+2 Cards. +2 Actions. +1 Buy.
While this is in play, when you buy a card, trash each copy of that card you have in play.
I want to say this is a huge trap. Why buy a card if your going to trash a copy of it netting you nothing? Maybe that's the point… So basically it taboos all the cards you have in play, and if that is including my precious Gold, Wharves, and Hunting Parties… I may be a little upset. However, I do see its end game potential. I suppose Vanguard is great if you get a few for a mega turn buying out the Provinces, but it seems like that would take to much work.
Pariah
Types: Action
Cost: $5
Gain a card costing up to $6. Each other player may gain a Curse. If he does, he gains a copy of the card you gained.
Looks like a "fixed" Monastery. I was a fan of an "expensive" Workshop variant before, so I am a fan of this one as well. Although it doesn't fit Cornucopia's theme too much.
Theater
Types: Action
Cost: $4
+2 Actions. You may reveal a Patron card from your hand. If you do, +2 Cards.
[hr[
Setup: Add an extra Kingdom card pile costing $5 or $6 to the Supply. Cards from that pile are Patron cards.
I'm back and forth on this one… I don't really want another village in Cornucopia. I do enjoy the extra pile mechanic, but if you are playing with Theater AND Young Witch… then you are dealing with a 12 card Kingdom. Not sure how I feel about that. It may be fun… maybe once… It may not fun and be a pain…
Carnival
Types: Action – Attack
Cost: $3
+1 Card. +1 Action. The player to your left chooses a card in the Supply without a Carnival token on it. Either gain a copy of it or each other player gains a copy of it, your choice. Put a Carnival token on that pile. If each Supply pile has a token, remove all the tokens.
I'm not a big fan. It is Jester-ish. I don't like the idea of eventually having to put a token on the Province pile. I would like it more if it were Supply piles that weren't Victory piles, but I don't think that would make me like it enough too vote for it.
Harvest Queen
Types: Action
Cost: $5
Set aside any number of differently named Action cards from your hand. Play them in any order.
This looks intense. I like the Tactician interaction, but am I right in saying this is basically a village that gives +? Actions for each different action card? A $5 card that only gives +Actions doesn't sound that great. Any thoughts on that?
Showman
Types: Action
Cost: $3
+1 Action. Reveal a card from your hand, then reveal the top card of your deck. If they don't match, +1 Card and +$1.
Like Showdown said, it is thematically a fantastic card. It is simple and fits Cornucopia's theme. Plus I always like the guessing type cards in Wishing Well, Mystic, etc. One of my favorites.
Old Gaffer
Types: Action – Attack
Cost: $4
+$2. Each other player may reveal a hand without duplicate cards. If he doesn't, he gains a Curse.
This is a good card… However, I don't like it for two reasons:
1) It is a terminal Silver that is already found in Fortune Teller and Jester.
2) It is a Cursor… and we already have Young Witch and Jester
Hydra
Types: Action – Reaction
Cost: $999
+1 Action. +1 Card per Hydra you have in play (including this).
When another player plays an Attack card, you may discard this. If you do, gain a Hydra.
I laughed so hard at this… Yet, I (as well) could not give a fair evaluation. I don't think I like this because it almost forces you to rush to win the Hydra split at least to deny your opponent getting the majority. I see this most fair at $5 because it would take a while to buy/gain enough in order to be effective (similar to Duke).
Dairy
Types: Action
Cost: $5
+3 Cards. Reveal then discard any number of cards. If you discarded any cards, gain a card with cost up to $1 plus the number of differently named cards discarded. If you discarded at least 3 differently named cards, +1 Action.
Not a fan. This also looks like a "fixed" Monastery. It doesn't look like it would consistently be better than Workshop/Ironworks/Armory. I know there is a chance to gain cards costing more than $4, but I don't think this will play as well as the author intended. I like Pariah more.
Sharpening Stone
Types: Treasure
Cost: $4
Worth $1. If you had at least 4 differently named cards in play (not including this), +1 Buy and +$2.
Very similar to Ingot. I like Ingot more because it can cost up to $4. Also, I feel like this is too easy to activate making it a $4 gold with a buy mid-late game, I wonder if $5 would be a better cost. Maybe I'm wrong, as I am awful with pricing as well. Concept wise, it is the same as Ingot. Ingot rewards just treasure diversity, Sharpening Stone rewards action/treasure diversity. I wonder if neither will win and steal votes from the other. I agree with Eggplantation that Ingot it slightly better executed.