The power of card advantage is obvious, yet this great card deserves a couple of words. For the cost of 2 resources and a Dwarf hero in play, you get selective card advantage. Being able to get the best card from the top two cards of the deck is fantastic. It says "Add 1 to your hand", which is important, when the game punishes you for card draw, with this specific wording you escape punishment. Another great thing about the card - when you look at the top 2 cards of the deck, they technically don't leave the deck, and one of the cards is discarded, which means the power of KUtM is cranked up in "mining" decks. It feels so great to get a card you need in hand and discard e. g. a Hidden Cache or an Ered Luin Miner for more value.

I would always include 1-2 copies of KUtM, if I have a Dwarf hero and Leadership as one of the spheres in the deck, maybe 3x if the deck that does not have very many other card advantage options.