Sandstream Arch

Tap an untapped creature you control: Exile the
top card of your library. If its mana value is less
than the power of the creature tapped to activate
this ability, you may play that card without
paying its mana cost.
Dreams reside beyond a lazy drift;
The sands of time whistle in the wind.
What hope anew to find! Go now, be swift!
Let go of all the weight that you have sinned.