Hypatia, End of Era

When Hypatia enters the battlefield, put a +1/+1 counter on her for each mathematician in play.
Divide the battlefield into two battlefields. Each opponent decides for each creature they control whether it is in battlefield 1 or 2. You decide for
each creature you control. Until the end of the
game, creatures may not block other creatures in
a different battlefield.When a creature enters the battlefield, its controller chooses battlefield 1 or 2.
Life is an unfoldment and the further we travel