Kindred, the Eternal Hunters

Pay 6 life: Choose an opponent.
At the beginning of combat on the chosen
opponent's turn, remove all bounty counters
from creatures they control. Then randomly
choose a creature that player controls, and put a
bounty counter on it. If that creature does not
attack this turn, its controller loses 4 life and
you gain 4 life.
First Strike, Deathtouch