There are 50,000 facts prove evolution incompatible with chance.  The shamans were great believers in the mission of chance as revelatory of the will of the spirits; they frequently cast lots to arrive at decisions. 
To continue to ascribe things difficult of comprehension to supernatural causes is nothing less than a lazy and convenient way of avoiding all forms of intellectual hard work. Luck is merely a term coined to cover the inexplicable. 
See also: UB 86:1.