Nin, the Pain Artist

Legendary Creature — Vedalken Wizard

, : Nin, the Pain Artist deals X damage to target creature. That creature's controller draws X cards.

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2011-09-22:
If the creature is an illegal target when Nin’s ability tries to resolve, it won’t resolve and none of its effects will happen. No player will draw cards.
2011-09-22:
You may choose a value for X that’s greater than the creature’s toughness. Its controller will draw that many cards.
2011-09-22:
The effect is not optional. The creature’s controller can’t choose to draw fewer than X cards.
2011-09-22:
If the ability resolves, but the damage is prevented or redirected, the controller of the targeted creature will draw X cards, regardless of how much damage was dealt or what the damage was ultimately dealt to.
2011-09-22:
If the damage is lethal, the cards are drawn before the creature is destroyed (the next time state-based actions are checked).