Deck thinning is the term for cards that are used to reduce the size of your deck to increase the chances of drawing whatever particular card you may need. Single-use cards that only draw one card, such as "Jar of Greed" or "Upstart Goblin" have little use other than to thin the deck. Deck thinning may be achieved by searching for specific cards from the deck, increasing the number of cards you draw in a turn or simply by getting rid of cards in your Deck such as with "Foolish Burial" or "Painful Choice". Deck thinning is generally not considered useful in large decks since it is simpler to just make a deck with the minimum of 40 cards and have the deck-thinners among those 40 cards.