Grove of silence

Grove of silence doesn't untap during your untap step.
Grove of silence enters the battlefield tapped.
As long as Grove of silence is untapped, green creatures you control with converted mana cost of {3} or less have hexproof.
{2}{g}:{ut} Grove of silence
{w}{t}: As an additional cost to activate this ability, return Grove of silence to your hand. : add {g}{g} to your mana pool, and your opponents cant cast spells this turn.