Ditto

Imprint - When Ditto comes into
play, you may remove target nontoken
creature from the game. (The removed card
is imprinted on this artifact.)
As long as a creature is imprinted on
Ditto, Ditto, has that card's power, toughness,
and creature types. It's still a Shapeshifter.
Pokedex Entry: Capable of copying an
enemy's genetic code to instantly transform
itself into a duplicate of the enemy.