It's fatal. I don't think it's known for sure why. I'm pretty sure the theory is that champagne amplifies the spider wobble to an extreme degree, making snakes that simply can't function. They die in the egg or they fail to thrive and die. The guy who would know the most about it is Kevin McCurley and he talks about fatal combos in two videos:
(The forum is only letting me post one, but you should be able to find the second part easily)
Black Pewter het Hypo Vestris; Black Pastel Enchi Zamira; Black Pastel Cheryn; Hypo Enchi Sofia; Lesser Pastel Eren; Super Mojave ???; Piebald Mako; Fire Vin; Pastel Estelle; Spider Hanji, Ezri; Normal Angelina, John, Aradia; Mojave Joe; Anerythreustic Kenyan Sand Boa ???; German Shepherd Dog Atticus; Rats Snowman, Colette, Calliope, Eliza, ???, ???
ALL THAT SLITHERS - Ball Python aficionado/keeper
breeder of African soft fur Rats. Keeper of other small exotic mammals.
10 sugar gliders
2 tenrecs
5 jumping spiders
paludarium with fish
Brisingr the albino
Snowy the BEL
Piglet the albino conda hognose
FINALLY got my BEL,no longer breeding snakes. married to mechnut450..
Same reason why no one produces super spiders or super champs, something just doesn't work out and they die.. Yay for genetics :/ It will probably be a while before anyone actually figures it out... All you need to know is don't do it :/ not worth the risk.