Cunning Reversal

If an opponent just caused you to lose life, a
creature you control to receive damage or a spell
or ability you control to be countered or
redirected, deal 10 damage to that opponent.
"And the voyager, repining,
Sees the wicked death-fires shining,
Hears the wicked petrel's whining
As he helpless drifts to sea."
—H.P. Lovecraft