Corpse Weeper

Flying, Ward {2}
Whenever Corpse Weeper attacks, you may
choose a target creature not named Corpse
Weeper. If you do, Corpse Weeper becomes the
types of the chosen creature in addition to its
other types. (This effect lasts indefinitely.)
Whenever one or more counters are put on one or
more creatures that share a creature type with
Corpse Weeper, Choose a counter put on a
creature that way and put that many counters
of that kind on Corpse Weeper.