The Sword Of The Emperor

Creatures you control get +1/+1.

{1}{w}{w}, {t}: Destroy target creature that dealt
damage to you this turn.

The Emperor's Sword, also called the Sword of the Emperor, is a famed relic blade that was wielded by
the Emperor of Mankind Himself during the Great Crusade and the Horus Heresy.

— Codex Adeptus Astartes - Space Marines —