Michael Myers

Shroud

at the beginning of your upkeep, choose an opposing creature a player controls to give a obsession counter.

Obsession counters give target creature -1/-1
and target creature is unable to attack.
At the beginning of your next upkeep, if the creature with the obsession counter was taken off the battlefield by any means, give this creature a +1/+1. If the creature wasn't taken off the battlefield, remove the obsession counter.