Hello!
I've
noticed some recent cards that let you set aside cards until your next shuffle.
This inspired me to make a new general concept for Dominion, a "queue pile" (better name suggestions?). The queue pile is a pile that every player may have next to his discard pile. When the player shuffles, all cards on the queue pile are discarded as a new discard pile. This means a card on the queue pile will come up one shuffle later. Cards on that pile are considered as part of the player's cards (important for the Endgame scoring), but not part of the discard pile (i.e. Counting House, Hermit, Philosopher's Stone can't access the queue pile).
Some card ideas (EDIT: Now sorted according to interestingness):
Grand Cellar (Action) $5
+1 Card
+1 Action
Put any number of cards on your queue pile.
Per card that you put on it: +1 Card.
Provost (Action) $3
+$2
Look through your discard pile and put up to 2 cards from it or your hand on your queue pile.
Mountain Village (Action) $4
+1 Card
+2 Actions
In this Clean-up phase, when you discard Treasure cards from play, put them on your queue pile.
Custodian (Action) $2
+1 Action
Look at the top card of your deck. Trash it or put it on your queue pile.
Donjon (Action) $5
+4 Cards
Put a card from your hand on your queue pile.
______________________
When you gain this, put it on your queue pile.
Prediction (Action-Attack) $4
+$2
Each other player reveals the top two cards of his deck.
He discards any Treasures, puts Actions on the queue pile and puts the rest back in an order he chooses.
Clerical Seal (Treasure) $5
Worth $2
+1 Buy
_____________________
While this is in play, when you gain a card, put it on your queue pile.
River Island (Victory-Reaction) $3
Worth 2 VP
_____________________
When you discard this other than from your queue pile, you may reveal it. If you do, put it on your queue pile.
Elite Workshop (Action) $5
Gain a card costing up to $5 and put it on your queue pile.
Butler (Action-Reaction) $3
Put a card from your hand on your queue pile. Gain a card costing less than it.
______________________
When you discard a card other than during a Clean-up phase, you may reveal this from your hand. Put the card you discarded on your queue pile.
Forest (Action) $5
+$4
+1 buy
_______________________
When you discard this from play, put it on your queue pile.
Dark Room (Action) $5
+2 Cards
You may choose an Action from your hand. Play it twice.
When you discard that card, put it on your queue pile.
Ruby (Treasure-Reaction) $4
When you play this, count the cards in your queue pile.
Worth $1 per card in your queue pile.
_____________________
When you gain a card, you may reveal this from your hand. Put the new card on your queue pile.
Trading Haven (Action-Reaction) $2
+1 Card
+1 Action
You may put a card from your hand on top of your deck.
_______________________
When you put a card on top of your deck, you may reveal this from your hand.
If you do, put this and the other card on your queue pile and gain a Gold.
Old Versions:
Dark Room v1 (Action) $5
You may choose an Action from your hand. Play it three times.
When you discard that card, put it on your queue pile.
Elite Workshop v1 (Action) $3
Gain a card costing up to $5 and put it on your queue pile.
_______________________
When you discard this from play, put it on your queue pile.
Elite Workshop v2 (Action) $6
Gain a card costing up to $5 and put it on your queue pile.
Elite Workshop v3 (Action) $5
Gain a card costing up to $5.
If it's a Victory card, put it on top of your deck.
Otherwise, put it on your queue pile.
Donjon v1 (Action-Reaction) $3
+3 Cards
Put a card from your hand on your queue pile.
______________________
When you gain a card, you may reveal this from your hand. Put the new card on your queue pile.