Shapeshifter
Shapeshifters are 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.
Dominarian Shapeshifters
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Vesuvan Shapeshifters
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Kamigawa Shapeshifters
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Lorwyn-Shadowmoor Shapeshifters
Changelings
Changelings are harmless creatures native to Lorwyn involuntarily assume the shapes of the creatures around them to their pleasure or annoyance. It is believed they reproduce in the secret cave of Velis Vel.
Mimics
After the Great Aurora, the changelings were transformed into Shadowmoor's mimics, aggressive and vicious creatures that attacks in packs while taking forms that resemble warped reflections of their victims.
Pucas
Found only in Shadowmoor, pucas are horse-headed shapeshifters whose moods swing wildly from mischief to malice. They are amphibious and are particularly common near flooded swamps, mountain streams, and waterfalls.
Mirrodin Shapeshifters
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Rathi Shapeshifters
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Ravnican Shapeshifters
Lupul
Within Ravnica, a group of amoeboid insects called lupul can fuse together to impersonate other beings. Thought to have been defeated centuries before the Decamillenial, they resurfaced under Szadek's commands, until his control was disrupted by Jarad. They resurfaced years later impersonating the nephilims of yore.