One of many Dwarven cards that runs with the idea of “mining” your draw deck, Delving is a solid method of card draw when you do not want to risk discarding Shadow cards. It can be used in decks with a splashed Gimli for easy draws but is especially useful in mono-Dwarf decks with the plentiful exertion fodder (although later game, Book of Mazarbul is a better choice for card draw instead). Remember that the Rule of Four applies, so two played on the same phase will only net you four cards for and two exertions.