Phone a Friend

Pick someone from your contacts and call them.
Tell them to "say yes" and do not say another
word. If they say "yes," return all creatures in
your graveyard and all exiled creatures to the
battlefield. Everyone else may play any creature
in their hand at this moment with no mana cost.
If they say "no" or anything besides "yes," all
players must exile all their permanents and tap
their lands. On everyone's next untap step, they
may pick only two lands to untap.