Tonlè Sap

Tonle Sap enters the battlefield tapped.
{t}: Add {u}{g} to your mana pool.
When Tonle Sap enters the battlefield,
return target creature an opponent controls to
its owners hand.
One of the world's most varied and productive ecosystems, the great lake of Cambodia sustained the Angkorian civilization for centuries, and continues to
sustain life in Cambodia today.