SCSS won't compile due to missing commas
Lines 272-274 of _variables.scss
Change:
("Xbox Media Promo" 'pxbox', "\e915"),
  ("Magic Premiere Shop" 'pmps', "\e919"),
  ("Mirrodin Pure" 'pmpu', "\e91a"),

to 

  ("Xbox Media Promo", 'pxbox', "\e915"),
  ("Magic Premiere Shop", 'pmps', "\e919"),
  ("Mirrodin Pure", 'pmpu', "\e91a"),