Envious Bloodline

You are descended from doppelgangers, changelings, or other transforming creatures. Your powers tend not to even be your own. These sorcerers use the powers of others to aid in whatever task, good or evil, they are trying to accomplish.

Deceptive Heritage

When you choose this sorcerus origin at 1st level, you gain proficiency in the deception skill and have advantage on such checks to avoid being identified when you are in a disguise.

Envious Mimicry

Also at 1st level, the malleable form of your ancestor flows through your blood, you know the alter self spell and can cast it at will.

Shared Transformation

Starting at 6th level, you gain the ability to change others as easily as yourself. When you cast alter self or an illusion spell that has a range of self, it now has a range of touch for you and can affect other creatures as if they cast it.

Greater Falsification

At 14th level, you gain the ability to change into greater forms with ease. You learn the polymorph spell. This does not count against the number of spells you can know. You can spend 4 sorcery points to cast polymorph without expending a spell slot.

Master of Transformation

Stating at 18th level, due to your mastery over transformation, you can cast many at once and at full effect. You no longer need to concentrate on the polymorph, disguise self, or alter self.