How do you balance Keen Mind with Wizards? By reading what Keen Mind does, it would allow for a Wizard to just see a spell being used and then can use it themselves. There is MUCH MORE to casting a spell beyond a gesture and a sound. The mind of the mage has memorized elaborate equations and glyphs they weave in their mind’s eye as they cast it. Just seeing a spell be cast wouldn’t enable you to.
— Matthew Mercer (@matthewmercer) December 22, 2018