No way to magically disguise 3rd party until True Polymorph?

@KrisKoletar @ChrisPerkinsDnDDisguise/Alter Self, self only. Polymorph, beast only. No way to magically disguise 3rd party until True Poly? yes, by design – forces reliance on checks

— Mike Mearls (@mikemearls) March 21, 2016

@KrisKoletar @ChrisPerkinsDnDAh. Prevents wizards from being Swiss Army knives? yes! tried to cut back on that.

— Mike Mearls (@mikemearls) March 21, 2016