Glorious Sacrifice

As an additional cost to casting Glorious Sacrifice, sacrifice a creature.
Destroy all attacking creatures.
"Onward they came, a tide that seemed as inexorable as the ocean itself. Only one stood before them, defiant, not letting any pass. When all was over, the body could not even be identified, but whoever they were, they have our eternal thanks."
-Inscription on Tomb of the Tidebreaker