Rivendell

Rivendell enters the battlefield tapped unless you control a legendary creature.
{t}: add {u}.
{1}{u}, {t}: Scry 2. Activate only if you control a legendary creature.
""The Cave of Origin? But that's right here! I need
you to do better than that! Please, I need you to think
about where Rayquaza might be right now.""
-Wallace