Ditto

Ditto enters the battlefield as a copy of target
creature.
Ditto is the same creature type as target creature
and gains all of the target creatures abilities, power,
and toughness
{b} or {u} or {g} or {r} or {w}: Ditto is a copy of target creature of selected color.
Ditto looses all abilities, power, and toughness of
prior target creature.
Ditto now has all abilities, power, and toughness of
new target creature