Did not find any other post about this, but I can buy packs with ONLY mystic creatures. So I imidatly bought a booster. Well only commons and uncommon. Sorry but this should be fixed right away.
Mystical and Mythic are different words, though close enough to be confusing. They could definitely have called them fantastical creatures or something. If you’re ever curious about the possible contents of a pack, you can click the little (i) icon.
“Mystical” in this context refers to imaginary, fanciful creatures like Dragons and Angels, which are the stuff of fantasy. As opposed to more mundane creatures like humans and Eldrazi, which we see every day.
I posted a thread about this the last time around… it seems to have gone now…
I met the eldrazi twins at the supermarket the other day, they are identical! 
On a serious note, could anyone honestly think that a booster pack with only mythic creatures would be sold for only 70 crystals? 
Yeah, the pack with one gauranteed mythic is sold for 1050 crystals…
To think that packs with all mythic cards would be sold for so little…