A creature only exists on the battlefield, while a creature spell exists on the stack. As such, Lens of Clarity doesn't let you see face down spells before you decide whether to respond to them.
Magic Rules Tips
…and knowing is half the battlefield
…and knowing is half the battlefield
A creature only exists on the battlefield, while a creature spell exists on the stack. As such, Lens of Clarity doesn't let you see face down spells before you decide whether to respond to them.