The Derthonian Massacre

This spell can't be countered.
All creatures except Wraiths, Horrors, Liches, Mummies, Phyrexians, Skeletons, Specters,
Spirits, Vampires, Zombies, Bloodwitches, Graveborn, and Shades gain -X/-X until end of
turn where X equals the total amount of
creatures in all graveyards.
All Humans, Elves, Dwarfs, and Fairy creatures
that die instead, come under your control at your
end step with decayed.