Creature — Shapeshifter
Shapeshifter is a creature type describing a loosely-defined group of beings capable of assuming other shape and forms, often imitating other beings. They can be found in all colors of mana, but predominately in blue. The first creature to bear the type was Unstable Shapeshifter in Tempest. Vesuvan Doppelganger and Clone from Alpha, and Shapeshifter from Antiquities were later issued errata to become Shapeshifters, as well.