Kapatcir's Revenge

Whenever a creature attacks you or a
planeswalker you control, that creature's
controller loses 1 life and you gain 1 life.
—
The Thunderbird was still a monster that cared not for
the worship of mankind. They knew it not, and
regarded the unpredictable actions of the Thunderbird
as divine revelations. Yet thunder was its breath,
as were the fates of men. From the sky, men were no different from animals.