The house of the squirrels

Whenever The house of the squirrels enters
the battlefield, you must pay {w}{w} or {g}{g}
{g}{g}: Put two 1/1 green squirrels
onto the battlefield.
{w}{w}: Create 2/2 big white squirrel token creature.
{t}{w}{w}:Add {w}.
{t}{g}{g}:Add {g}.