Twisted Obsession

Enchant creature
Enchanted creature has +1/+1, deathtouch, and menace.
At the beginning of your upkeep, put a Dismay counter on Twisted Obsession. Then, if there are three Dismay counters on Twisted Obsession, exile both Twisted Obsession and enchanted creature, then return Twisted Obsession to the battlefield transformed.
Ever since she found the blade, she hasn't quite been herself...