The Iron Bank of Braavos

When the Iron Bank of Braavos enters the battlefield return a land you control to your
hand.
{t}: add {c}{c} to your mana pool.
{t}: add one mana of any color to your mana
pool.
{x},{t}, sacrifice the Iron Bank: reveal the top X
cards of your library, put all lands revealed this
way onto the battlefield tapped and all non-land
cards into your hand.