Oromë's Ancient Hunt

Target creature you control gains indestructible
until end of turn. If it's legendary, it also gets
+1/+1 until end of turn and fights target creature
you don't control. (Each deals damage equal to its
power to the other.)
"As a mighty hunter he came with spear and bow,
pursuing to death the monsters and fell creatures of
the Kingdom of Melkor, and his white horse Nahar
shone like silver in the shadows."