Splinter's Technique (Showcase) [Teenage Mutant Ninja Turtles]

Cost: 3 B Sneak 1 B (You may cast this spell for 1 B if you also return an unblocked attacker you control to hand during the declare blockers step.)
Search your library for a card, put that card into your hand, then shuffle. Behold the secret technique only taught to true masters of the Foot Clan.