If you cast Noxian Guillotine on a 12 might unit and then cast Disintegrate on it, does Disintegrate draw you a card?

Ruling: No, you do not draw a card. Noxian Guillotine creates a delayed trigger that kills the unit when it takes damage, so the kill credit goes to Guillotine's delayed trigger, not to Disintegrate.

Sequence:

• Noxian Guillotine resolves and creates a delayed triggered ability
• Disintegrate resolves and deals 3 damage to the unit
• The delayed trigger from Guillotine goes on the chain to kill the unit
• The delayed trigger resolves and kills the unit

Nuances:

• Kill instructions work differently than damage for determining kill credit
• The rule about damage credit looking back at the last resolved spell does not apply to explicit kill instructions
• Disintegrate's text may receive errata in the future which could change this interaction