Thriog, Awakened Summit

You may pay {r}{g} and return four basic lands
you control to their owner's hand rather than pay
Thriog, Awakened Summit's mana cost.
Haste, Trample, Reach
{r}{g}: Until end of turn, lands you control
become elemental creatures with trample, haste,
and "This creature's power and toughness are
equal to the number of lands you control."