Quixotic Dune

{t}: Add {w}{u}{b}{r}{g}. Quixotic Dune becomes a 0/6 blue Wall creature with defender and "Whenever an opponent casts a spell, you may put a sand counter on Quixotic Dune." If Quixotic Dune has ten or more sand counters on it, sacrifice it and create a legendary 7/7 camel creature token named "Mirage Mirage Mirage."