Cast Magic Circle (Metamagic)
The witch can augment her spell casting via the creation of a magic circle.
Liber Mysterium
The Netbook of Witches and Warlocks
By Timothy S. Brannan and The Netbook of Witches and Warlocks Team
Prerequisites: Spellcaster level 5+, Craft (Magic Circle); 5 Ranks or Knowledge (Arcana); 5 Ranks
Benefits: With the Cast Magic Circle feat the witch can imbue magic circles that will grant special effects while standing in the circle, depending on the type of magic circle created.
Creating a magic circle only costs what the item used to draw with costs. For example a witch could create a magic circle out of salt or simply drawn into the dirt. Unfortunately, a stray wind or a clumsy party member could wreck the circle, which would ruin it completely. More crafty and elegant witches will paint the circles into the ground, or sometimes create them out of tile in their home.
Creating a magic circle costs 200 xp for every 5′ diameter the circle, regardless of material. The time it takes to craft a magic circle is often dependent on what was used to create it. Placing the final enchantments on the circle takes 1 minute per foot in its diameter. So if the witch were to create a 20· long Thaumaturgic Magic Circle out of tile in her home, it would require an 800 xp sacrifice, and would take 20 minutes to enchant, plus the time it actually took to craft the magic circle out of tile.
A magical circle can also be created to augment any ritual casting.