Servant of Bolas

Erupt {4}{u}{b}{r} (While you're searching your library, you may cast this card from your library
for its erupt cost.)
When Servant of Bolas enters the battlefield, if its erupt cost was paid, you may search your library for a Bolas planeswalker, reveal it, and put it into your
hand. If you search your library this way, shuffle it.