Spontaneous Arability

You may tap a Desert you control rather than
pay {g} when generating mana to cast this spell
Sacrifice two lands.
Search your library for four non-desert lands,
three of which must be basic and reveal them.
Shuffle your library. Put three of those lands
into play tapped and one into your hand
" The unreaped Crop had never seen such a
strange being. Nor such instant, verdant power."