Trample
If Death, the Unconquerable would exit the battlefield, shuffle Death into its owner's library instead.
At the beginning of each endstep, Death deals damage equal to its power to each creature that was the target of a spell or ability this turn.
See Death, the Silent. I did want "At the beginning of each endstep, each creature fights another creature at random.," but that would probably take too much time.
This iteration was based around killing creatures that tried to buff up.