Mistveil Grove

Mistveil Grove enters the battlefield tapped.
{t}: Add {g} or {u} to your mana pool.
{1}{g}{u}, {t}: Put a fog counter on Mistveil Grove. Activate this ability only during your upkeep.
{t}, Remove a fog counter from Mistveil Grove: Creatures you control gain hexproof until end of
turn.
"Within the whispering mists, nature's secrets lie
hidden, protected by the mystical embrace of the
ancient trees."