If some of the targets become illegal for Mythos of Vadrok, the original division of damage still applies, but the damage that would have been dealt to illegal targets isn't dealt at all
However, Great Ball RG 92 has an official errata that changes its text to match that of the Great Ball from Crown Zenith, making the Great Ball from EX FireRed & LeafGreen also legal for play in the Standard format
Doubling Season alone would make green worth including in a planeswalker deck, but it isnt the only option
Bumbleflower | Illustrated by Marta Nael Baylen, the Haymaker | Illustrated by Ryan Pancoast Mr
You will probably see it in the Witch lists with Atraxa, Praetors' Voice, as one of the "superfriends" that benefits from the proliferate mechanic
(2006-07-15) After Commandeer resolves, you control the targeted spell