Solemn Heartseeker

When Solemn Heartseeker enters the battlefield, search your library for a card with Soulbond,
reveal it, and put it into your hand. Then shuffle
your library.
Solemn Heartseeker has persist as long as it is
paired. (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its
owner's control with a -1/-1 counter on it.)