Hazezon, Spirit of the Sands

When Hazezon, Spirit of the Sands enters the
battlefield all lands you control become 2/2 Sand
Warrior creatures with trample, indestructible
and haste until the end of the turn.
{r}{g}{w}{t}: Sacrifice three lands and exile
Hazezon, Spirit of the Sands and return him to
the battlefield under his owner's control. Activate
this ability only any time you could cast a sorcery.