mtg blue search your library for a card Rules Text: search, library, card, creature, your, Type: Instant, Sorcery, Colors: Blue, 82 cards Stock image c!u o:"search your library for"

Other times, you'll need to be more careful

Preventing cards you dont need from ending up in your possession stops your collection being ridden with cards youre never going to use

If you assemble Tron on turn three and you dont have a Karn Liberated in hand to cast instead (which is what you really want in these matchups), then you can cast your Thoughtseize-on-a-stick and present a clock that will kill your opponent on your eighth turn

The Soul Stone is the kind of mana rock we just dont see much in Magic: The Gathering these days

For example, blue decks in Pauper use Thought Scour and Mental Note to power out Tolarian Terror and Cryptic Serpent, while Vintage Dredge decks use cards like Prized Amalgam and Vengevine to flood the board with creatures from the graveyard