My thoughts on any of them about which I had thoughts:
Wizard
Types: Action – Prize
Cost: $0*
If this is the first Action card you played this turn, +3 Cards and +1 Action. Otherwise, +1 Card and +3 Actions.
I like this concept, but I feel like the condition in which it's really good is too niche. Drawing cards is kind of undesirable if you still have this in your deck. Maybe if the less-good version were better? I just feel like there's a huge discrepancy between +3 Cards, +1 Action and +1 Card, +3 Actions.
Shield of Virtue
Types: Action – Reaction – Prize
Cost: $0*
+1 Card. +1 Action. Look through your discard pile. You may trash a card from your hand or your discard pile.
When another player plays an Attack card, you may reveal this from your hand. If you do, you are unaffected by that Attack.
Pretty straightforward. I like being able to trash from your discard, and a cantrip reaction to Attacks is pretty good. I think it works.
Rusty the Donkey
Types: Action – Prize
Cost: $0*
+4 Actions. Trash a card from your hand. Choose one: Gain a card with cost up to the number of unused Actions you have (Actions, not Action cards); or gain a card costing up to $4 more than the trashed card; or gain two cards each costing up to $2 more than the trashed card.
The gaining effect is all right, but doesn't seem like it'll be worth it very often. Not to mention counting spare Actions gets to be a pain after 2 or 3, but maybe that's just me. The first remodeling effect seems fine, but the second seems way too good. Trash a Gold, gain two Provinces? And with spare actions after that? I'm pretty sure that's ridiculous, even for a Prize.
Servicemen
Types: Action – Prize
Cost: $0*
+1 Action. Trash a card from your hand. Gain a card costing up to $3 more than the trashed card, putting it into your hand.
I think this is a better way to handle the Remodeling. Not crazy about the name, though.
Wishing Ring
Types: Action – Reaction – Prize
Cost: $0*
+1 Action. Choose an Action card from the Supply and play it.
When another player plays an Attack card, you may reveal this. If you do, choose one: Gain a copy of the Attack card, putting it into your hand and this card onto your deck; or you are not affected by the Attack.
It's not entirely clear how the top works, as has been said. I don't actually gain the card, right? It's basically Band of Misfits? Why not "Choose an Action card from the Supply and copy its effect"?
Jousting Rod
Types: Action – Prize
Cost: $0*
+1 Action. Gain an Action card costing up to $5, putting it into your hand.
When another player plays a Tournament, you may discard this. If you do, gain 2 Action cards each costing up to $5, putting them into your hand.
I actually really like this one. I'm assuming it's supposed to also be a Reaction because of the bottom half?
Grace of the King
Types: Action – Prize
Cost: $0*
+1 Action. While this is in play, when you play an Action card the first time this turn, play it again.
Clarification: This affects each individual card, not just each differently named card. So if you played this and played a Village (twice), then played another Village, you would also play that second Village twice.
This seems OP, even for a Prize. Any non-terminal is now a Village, which means if you have a Lab or something the rest of your turn is now ridiculous.
Advertiser
Types: Action – Prize
Cost: $0*
+1 Action. +$2. Reveal up to 2 Action cards from your hand. For each card revealed this way, gain a copy of it.
I don't like the name. Too modern, and why would an advertiser be a Prize? I'm also unsure about the +$2. It seems tacked on. Maybe find something else that works better with the Action-duplicating for a bonus? What if you got to put one of the duplicates into your hand?
Remote Holding
Types: Action – Victory – Prize
Cost: $0*
+3 Cards. +1 Buy. You may trash a card from your hand.
Worth 30 VP if you have no other Victory or Prize cards in your deck.
I like the fact that you need a Victory card to get this but then you need to get rid of it for it to be worth much, but how often is 30 enough to win? It would be cool if there were potential for expansion. Maybe if it were just no Provinces and not no Victory cards? That would seem to go with the +Buy.
Parade (B)
Types: Victory – Reaction – Prize
Cost: $0*
Worth 1 VP plus 1 VP for every Prize in your deck.
When another player plays a Prize, you may discard this. If you do, gain that Prize when it is discarded from play, putting it on top of your deck.
What if you had to return it to the Prize pile if you decided to steal someone else's? Otherwise I don't see why the first person to get this isn't way ahead.
ECF Council
Types: Victory – Prize
Cost: $0*
Worth 1 VP per Tournament in your deck.
I don't really get the name. Also, it seems like this is unlikely to be much better for you than just a Duchy, but I guess it could be interesting.
Blessing
Types: Action – Prize
Cost: $0*
Look through your discard pile. Trash any number of cards from it.
If you have this, a Golem and no other Actions in your deck, this is effectively "trash anything you want from your deck." I can't decide if that's absurd or awesome.
Liege
Types: Action – Prize
Cost: $0*
+2 Buys. While this is in play, when you buy a Copper, you may trash a card from your hand and gain a card costing up to $2 more than it.
I dig the idea of "when you buy a Copper, X" but I don't know if I like your X. That said, I have no idea what I'd make it.
Fortune
Types: Action – Prize
Cost: $0*
Gain up to 4 Coppers, putting them into your hand. Reveal your hand. Reveal one card from your deck per Copper in your hand; put one of them that you choose into your hand and discard the rest.
While this is in play, you may not play Action cards from your hand.
I don't know if the benefit is worth gaining 4 Coppers. And that's without the "no other Actions" thing. I don't really get the point of that, also.
Shield
Types: Action – Reaction – Prize
Cost: $0*
+3 Cards.
When another player plays an Attack card, you may reveal this from your hand. If you do, draw until you have 6 cards in hand and you are unaffected by that Attack.
Super-Moat. I like it. Maybe give it a name that reflects its relation to that? City Wall or something? Although granted that doesn't make much sense as a Prize.