OK, how 'bout:
Life Support (Immunity: All terrestrial diseases and biowarfare agents, Longevity: Immortal), Sticky (Standard; +1/2), Usable As Attack (+1) (37 Active Points); Extra Time (1 Hour; -3), OAF Bulky Fragile (-1 3/4)--6 Real Points
Won't even need Megascale since it's Sticky. The person you give it to touches someone, who touches someone, and it's the whole "and they'll tell two friends, and they'll tell two friends."
You've then got worldwide immortality and no fear of disease, so the only way people die is either by accident or violence. Or, more likely, starving to death, because there ain't people dying, but there sure as heck are people breeding. Anyone up for a wild, wacky game of Global Starvation?