I enjoy the D6 system clones. I built a spell building spreadsheet for Open D6 and published a variant Fantasy SRD based on it..
I still use the old D6 spell building spreadsheet for 'weird magic' in my various games. The 'Speed' part of the spell builder allows for spell effects that creep slowly towards the target.
Anyway, I found a reddit thread with some helpful advice to navigate choosing MiniSix/OpenD6/Mythic D6.
https://www.reddit.com/r/OpenD6/comments/18pd8f9/regarding_the_d6_system_open_d6mini_sixmythic_d6/

