Manifestation Of Chaos

When Manifestation Of Chaos enter the
battlefield each opponent exiles the top card
of their library, you may cast spells that are
exiled this way if it's a creature spell, you may
cast it with out paying its mana cost, if it's a
noncreature, nonland spell it's controller may
cast it without paying it's mana cost.
At the beginning of your upkeep roll
two D6s, X is half of what you rolled
rounded down.