Aspect of the Wastes

Burrow {3}{r} ({3}{r}: Exile this creature and create a 0/1 colorless Sand creature token. Return it to the battlefield at the beginning of the next end step.)
Sacrifice a Sand creature: Add {c} to your mana pool. Spend this mana only to cast creature spells.
"The Shifting Desert is it? An apt name I might say. Should probably steer clear."
-Fre'Likhan, Emissary of the West