Fertile Wasteland

This land enters the battlefield tapped unless you
tap a creature you control.
{t}: add {1} to your mana pool.
{t}, tap two creatures you control: add{w}{w}
to your mana pool.

"The wasteland roun' ere is rich, but rough. Yer get
out what yer put in. "
—Albrechta, Weary Peasant