Bertie Lehrer, Hermetic Adept

{t}{u/r}{u/r}{x}: Deal X damage to target creature or planeswalker. Bertie Lehrer, Hermetic Adept takes X-3 damage. If this damage would destroy Bertie Lehrer, Hermetic Adept, exile it instead.
Knowledge is power. And sometimes, that power takes the shape of a big-ass fireball.