Search of the Black Riders

At the beginning of each player's end step, that player names three different cards, then looks at target opponent's hand. If the three named cards are in the hand, exile Search of the Black Riders. If you do, that player gains control of target creature. It becomes a Wraith Ringbearer in addition to its other types and has flying and hexproof.
"I knew that danger lay ahead. But I did not expect to meet it in our own shire." Frodo