Stream of Thought [Mystery Booster]

Set: Mystery Booster Type: Sorcery Rarity: Common Cost: {U} Target player puts the top four cards of their library into their graveyard. You shuffle up to four cards from your graveyard into your library. Replicate {2}{U}{U} (When you cast this spell, copy it for each time you paid its replicate cost. You may choose new targets for the copies.)