The golden monkey is a card that changes all the cards in your deck and your hand into random legendary cards.
I've noticed that it does not change a Burrowing Mine into a legendary. Does it also not change Ambush cards that are in my deck if a Rogue plays Beneath The Grounds, etc…
Best Answer
It looks like The Golden Monkey is bugged.
Some people have reported that it will not change all the cards put into your deck, others have claim that it will.
Sources for "Does not change added cards":
Sources for "Changes added cards":
From the people that have said it does not change, I have not seen actual visual proof,
but there is visible proof of people showing it does change added cards. This leads me to believe that the answer to your question "Does the Golden Monkey change ALL cards put into your deck?" is
Yes, the Golden Monkey changes ALL cards in your deck, including cards placed there due to an effect. However there also seems to currently be a bug where it may exclude cards added by an effect.