I just had the most off-the-wall planeswalker theory ever
What if planeswalker sparks are what remains of a worldsoul after its plane has been eaten by an Eldrazi brood?
Test of the theory: since two of the three Eldrazi titans have been destroyed and the other one is hibernating, we're going to see a lot fewer "proper" planeswalkers and a lot more people like Davriel, who is possessed by the undigested ghost of a plane, in the near future
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