Curse of Fool's Wisdom

If you become enchanted by your own Curse of Fool's Wisdom, you'll lose 2 life and gain 2 life whenever you draw a card. You won't lose the game if your life total is 0 or less between those events.

Once the enchanted player has drawn one or more cards, they'll still lose life (and you'll still gain life) even if Curse of Fool's Wisdom leaves the battlefield before its triggered ability resolves.

To determine the total cost of a spell, start with the mana cost or alternative cost (such as a madness cost) you're paying, add any cost increases, then apply any cost reductions. The mana value of the spell is determined by only its mana cost, no matter what the total cost to cast that spell was.