Shin, Who Hides in Plain Sight

{u/b}{u/b}{t}: This creature becomes a copy of target creature. It is a changeling in addition to it's
other creature types, and has Shin's abilities.
Upon using this ability while already copying a
creature, you lose all abilities and
power/toughness of the previous creature.
When this creature copies a creature, put a
madness counter on it. On your end step, If
you have 3 madness counters on this
creature, transform it.