Can Rickon duplicate the effect of harrenhal? or only effects that search entirely in your deck? thanks

Rickon only works with searches that look through the full deck.

An faq ruling on galbert Glover and Maester Luwin answered this predicament.

"I have Maester Luwin (Forging the Chain F21) and Galbart Glover (Called by the Conclave F41) out at the same time. If I win a challenge with Maester Luwin can I search the top 5 cards of my discard pile?

No. Searching the top 5 cards of your deck does not count as searching your entire deck."

As Rickon allows you to duplicate a search of your deck it wont work with 'x' card searches in the same way as the faq example, which is a shame as those combos would be amazing to pull off (although recycling no quarter/die by the sword would perhaps be somewhat broken)