Voldemort's Fatal Mistake Against Harry Potter.
Voldemort's decision to use Harry Potter's blood for his resurrection was a massive gamble that could have cost him everything he had achieved. The magical protection from Lily Potter's blood in her son's veins made it extremely painful and dangerous for Voldemort to even touch Harry. Pumping his new body's veins full of that blood could have resulted in his new body being born in intolerable agony and disintegrating just like his two previous ones. It would have been easier and safer to use any other British wizard's blood.