Copycat

You learn the art of mimicking someone's actions, learning what to do and not to do from watching others.

• Increase your Dexterity or Charisma score by 1.
• Whenever you witness someone use tools or make an Acrobatics, Deception, Intimidation, Performance, Persuasion, Sleight of Hand, or Stealth check, you may use your reaction to gain proficiency in that tool or skill until your next long rest or until you make a check with that tool or skill.