Kolloseir, Giant of Earth

If this card was to be countered, put on top of
your library.
{t} Add three {e}.
Spend 2 {e}: Add {g/w}{w}{g} to your mana pool.
Giant (This creature can block two creatures)
Hexproof (This creature cannot be the target of spells
and activated abilities your opponent controls)
Landfall: When a land enters the battlefield
under your control, you may choose a land that
gains: {t}Add {g/w}{g/w} to your mana pool.