Spellburst Savant

From publisher blurb:

The Spellburst Savant is a casting class unlike others that exist within the Pathfinder Roleplaying Game. Bearing a stunted 5-level spell progression instead of the 1–9 of a more normal spellcasters, they find success through a special ability called "Nova Spells" that allows them to apply metamagic feats on the fly to their limited magic, empowering the spells while charging their other class features each time they do so.

Inside is the Spellburst Savant class, four archetypes for it, a boatload of variant features, and two new metamagic feats, along with metamagic rods for both.