Arky, King of the Pit

When Arky, King of the Pit enters the battlefield, if you cast it, search your library for up
to five permanent cards with Pit-Master that each have different names, reveal them, put them into your hand, then shuffle.
Pit-Master — Whenever you cast a three color spell, you may pay {u}{b}, if you do, reveal the top card of your library, if it shares a card type with the cast spell, put it into your hand. Otherwise, put it into your graveyard.