Lake Zhava, Den of the Gitrog

Lake Zhava, Den of the Gitrog enters the battlefield tapped unless a land entered your
graveyard this turn.
{t}: Add {1} to your mana pool.
{2}{b}{g}{t}: Target player sacrifices a non-token
creature or land they control. They may search
their library for a basic swamp or basic forest
card and put that card onto the battlefield tapped.