Bolem

Bolem costs {x} less to cast for each Skeleton
and zombie in your graveyard and on the
battlefield.
When Bolem enters the battlefield create
a Bone and choose target opponent to gain
control of it.
{t}{3}{r}{b}{u}: scavenge target Skeleton or Zombie
to give target creature all of that creatures abilities.
{t}: Take the Precious(Bone) away
from target player.