Wood Scout
Types: Action
Costs: $4
+1 Buy
Reveal the top 4 cards of your deck. Put the revealed Victory and Copper cards into your hand. Put the other cards on top of your deck in any order.
I kinda like King Leon's version, but I'm trying to figure out an actual replacement for Secret Chamber. So maybe:
Secret Scout
Types: Action
Costs: $4
+1 Buy
Reveal the top 4 cards of your deck. Put any revealed Copper, Curses and Victory cards into your hand. Put the other cards on top of your deck in any order. You may put a card from your hand on top of your deck.
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When another player plays an attack card, you may play this from your hand.
The "You may put a card from your hand on your deck" part protects from trashing attacks (and Jester, but only once), and the "Play this from your hand" reaction keeps it from topdecking itself.
EDIT: ...meh. I think I'll use King Leon's WoodScout and do something else with Secret Chamber's reaction.
EDIT2: Ooohhh, here's an idea. If I just add the reaction to Secret Passage, do you think it'd be too strong? I don't think so since the effect is almost exactly the same except for protecting from trashing attacks (and Jester).
Secret Passage
$4 cost - Action - Reaction
+2 Cards
+1 Action
Take a card from your hand and put it anywhere in your deck.
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When another player plays an attack card, you may play this from your hand.