How to know it before locking PW ?
top node - vamp/horror/madness (black, red, or blue)
left node - spirits/zombies/delirium (white, black or blue)
right node - wolves/transform (green or red)
Theoretically there are 10 combinations of color trios. Are they going to skip white, blue, black because no one could fulfill wolves without a multi-color planeswalker?
I don’t know for sure, but that’s what makes the most sense. They want to make the event accessible to the most people.
They’ve already repeated one combination (white/red/black). That would seem to indicate they aren’t planning to hit every combination, though obviously I have no way of knowing.