SlivDrazi Replicator

SlivDrazi Replicator is a Sliver and an Eldrazi
{x}: Sliver Replicator becomes a copy of any Sliver
or Eldrazi on the battlefield until that Sliver or
Eldrazi leaves the battlefield, or this ability is
activated again with this ability in addition
to any other keywords and abilities where
{x} is that card's converted mana cost.
SlivDrazi Replicator's power and toughness
are equal to the number of Slivers and
Eldrazi currently in play divided by two
rounded up.