Sword of Evil's Bane

Indestructible
Equipped creature gets +5/+5 and has Protection
from Black and, "{t}: This creature deals damage
equal to its power to target creature. Use this
ability only as a sorcery."
"Whether skyward bound, adrift in time, or steeped
in the glowing embers of twilight, the sacred blade is
forever bound to the soul of the hero."
—Zelda