ok important question that I'm too scared to ask a proper magic person like MaRo or someone. Is a planeswalkers spark hereditary? like if ajani had kitten could they pop around the multiverse like little leonin explorers? could they planeswalk in the womb? like pregnant Elspeth wake up one morning and 'oh no my unborn child has found its way to innistrad' but if a spark needs to be ignited? can the spark be passed on, pre-ignit? does each person have their own spark or is it a trait to pass on?