Prince Dastan of the Sands

When you sacrifice a nonland permanent, you
may sacrifice a creature to exile the top card of
your library with five sand counterson it.
(Remove one sand counter from each card at
the beginning of each upkeep)
You may play lands and cast spells with exactly
one sand counter exiled this way without paying
their mana cost.
"Madness.. what magic is this?"—Prince Dastan