When Goblin Recruiter enters the battlefield, search your library for any number of Goblin cards and reveal those cards. Shuffle your library, then put them on top of it in any order.
Official Rulings for Goblin Recruiter
4/1/2008 : You can search for any card with the creature type Goblin, including Creature or Tribal cards. Older cards of type "Summon Goblin" and "Summon Goblins" also count. You can't search for cards that have Goblin in the name but don't have the creature type Goblin.
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