I know Devolution Spray is a 99% useless card.  But I have one in my fighting deck, with 4 recycles, why?  Because it is practically a "fake kill" card.  I have a Kabutops out with 50 damage on it.  I throw down Devolution Spray and de-evolve it to Mysterious Fossil, wow.  Now he kills Mysterious Fossil and can't take a prize.  I give it a rating of 3.75.  This is really hard to pull off, but possible.  Then I have the 4 recycles to try to get Kabutops back