I am at an interesting crossroads.  I'm sitting on 71 5-star champions and 13 6-star champs.  I've been very blessed with Mutant Champs, but I am missing most of the top champs (Quake, Corvus, Doom, Aegon, Torch, etc.) and don't have. a single 5-star science champ worth maxing out.  I'm now trying to figure out how to spend my incursions points.   
Buying the 5-star crystal is the cheapest option and I have over 50 percent odds of a.new champion - but likely to be middle of the road.  Buying 6-star shards is the priciest option and I wasn't figuring on doing this until I have at least 80 percent of the beyond-god-tier champs.
The Evolution Crystal has the best champ not named Ghost, but likelihood of Quake is 10 percent and the others are nothing special since I have apocalypse already.  The Genesis crystal is my best percentage wise since I can Red Magneto and Cosmic Ghost Rider are top tier champs, and Ghost Rider could be paired with my five-star blade and Stark SM.   The nightmare Crystal has my most desirable champ - Doctor Doom, but not much else.
So what would you do?  Below are pics for reference





