Skimmer, Seer of the Dead

Flying, Protection from creatures, deathtouch.
For every turn that Skimmer, Seer of the Dead
is in your hand, it's mana cost costs {2} more to
cast.When Skimmer, Seer of the Dead enters
the battlefield, each opponent loses 10 life,
sacrifices 10 creatures, gets 5 poison counters,
and mills until they reach the last card of their
library. You choose 2 non-land permanents
from each players graveyard, put those creatures
onto your battlefield tapped and attacking.