Wow what a card. This could be used in wild with Vanish to play vanish for 4 mana and then you immediately get it back in hand to cast again. Also, the Smokescreen idea sounds pretty good too. Super dangerous sleeper card if Blizzard adds more high cost rogue spells in the future. In any other class, this would be one of the best cards in the game imo but rogue simply doesn't have that many high cost spells.