When you have a few really good cards in your Deck, you want to get to them as fast as possible. This is when you use a technique called Deck Thinning to use one card to remove multiple cards from your Deck.
One card that can do this is the Spell Card "Gather Your Mind". When you activate "Gather Your Mind" you search your Deck for another "Gather Your Mind". After two turns you've removed 3 cards from your Deck in addition to the cards you normally draw.