Here's one of the original ideas I had for hinterlands:
Official
Reaction - Reaction - $4
When you gain a card, you may reveal this from your hand and set it aside. If you do reveal, the top 5 cards of your deck, trashing any number of them, discarding any number of them, and putting the rest back on your deck in any order of your choice.
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When one of your cards would be trashed, you may discard this card from your hand or set-aside area, and put the card that would be trashed on the bottom of your deck or in your hand, your choice.
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When you gain this card, set aside any number of the victory cards in your discard pile. The next time you reshuffle, discard all the set-aside cards, and reveal your hand. +1 Card per Card in your hand costing less than $4.