Which Infinity Stone (spoilers) was responsible for the randomization of deaths?

It is most likely that thanos used of all the stones in tandem. For example, the soul stone could've been used to destory the spirit or essence of a person while the mind stone takes away their conscience. The reality stone to physically turn them into dust as what happened in the movie and the space and time stones to scatter these particles throughout existence as to not violate any laws of matter. And finally, the power stone to augment the other stones and amplify their effects across the entire universe. black canary costumes

Of course this is just speculation as to how Thanos pulled off such an unimaginable feat. Afterall, the infinity gauntlet provides it's user with virtual omnipotence. In the comics, superheros simply turned transparent and faded out of existence rather than disintegrating into dust, so it proves that thanos could've chosen any of the infinite combinations(pun not intended) to kill half the life in the universe. Afterall, the infinity gauntlet does provide it's user with virtual omnipotence and cosjj.com . However, I belive his version served a better medium to convey the serverity of his actions on the big screen. green arrow and black canary costumes

young justice cheshire costume needed ALL that stones into the Infinity Gauntlet was that this would grant him infinite power. The six stones working together will allow him to do things no one stone can do such as randomization of deaths.