Unlimited/Easy Precursor Orbs
Go to any oracle statue and trade metal head skull gems to start an orb search challenge. Go to the orb and wait for the clock to turn to 00:00. Even though it says 00:00, it takes another second for the time to run out (I.E. 00:00 is really 00:00.100) So wait one more second, and then press Square to dash at the orb as soon as time runs out and the mission failed screen comes up. You will get 3 orbs, and be able to retry!