Doubtful Misery

Enchant player.
When enchanted player casts an instant or
sorcery spell, place two doubt counters on
Doubtful Misery.
When enchanted player has 10 or less health,
create a Cognitohorror creature token with
X +1/+1 counters, where X is equal to the
number of doubt counters on Doubtful Misery. Sacrifice Doubtful Misery.