Tim,The working farmer

When Tim, the working farmer enters the battlefield, create X {w} manna equal to the number of lands your control that are untapped
{3}: Create a 0/1 White Sheep Farm creature token that has "{t}add 1 manna of any color"
{5}: Create a 3/3 White Red Cow Farm creature token that has "{t}add 2 manna of any one color"
{7}: Create a 4/4 White Red Blue Legendary Sheep dog creature token that has "All Farm creatures untap during your end step"