The Curse of Self-Doubt

Enchant Player
Whenever enchanted player plays a nonland spell
roll a D20. If a 1 through 11 is rolled counter that spell. {x} Is equal to 13 minus the number cards in graveyards. At the beginning of your upkeep if the opponent had no spells countered last turn roll a
D20. If a 1 through 13 was rolled, all abilities for
The Curse of Self-Doubt cannot be activated until
your next turn.
The worst curse anyone could have is believing you are cursed.