Compression isn't good for business
![Smiley :)](https://elementscommunity.org/forum/Smileys/solosmileys/smiley.gif)
I think I'm gonna run with a 20% / 10% failure rate, thanks for the input guys, and as of right now an even chance of any spell being spawned.
@Rutarete I like the idea of the more valuable the creature you sacrifice, the more valuable the resulting spell, but that changes the mechanic of this one quite a bit, perhaps a new card altogether.