Valley of the Pears

Valley of the Pears enters the battlefield tapped.
At the beginning of your upkeep, you may pay {1}. If you do, create a 1/1 green Pear creature token.
{t}: Add {g}, {u}, or {r} to your mana pool.
{4}: Valley of the Pears becomes a 5/4 green Pear creature until end of turn. It's still a legendary land.