Blood Money

As part of the casting, you must cut one of your hands, releasing a stream of blood that causes 1d6 damage.

When you cast another spell within the same round, your blood transforms into a material component of your choice that can be used for that spell; creating this component requires the additional cost of 1 STR damage for every 500 to of its value (1 point for <500, 2 for 500-999, etc).

Unused components revert back to blood at the end of the round; a caster without blood or who is immune to STR damage cannot use this spell to create valuable components