Great Raven

Flash
Flying
Sacrifice Great Raven: Counter target spell. Activate
this ability only if Great Raven dealt combat damage
to the controller of that spell since the beginning of
your last upkeep.
"My eyes have looked upon a hundred thousand years
of human folly. Hence my tattered coat and broken
beak as evidence of your indiscriminate destruction.
I am but a winged witness of your eternal madness."
—Crone