If you could pick One of the Infinity Gems to have, which one would it be?
1-Time Gem: "Time travel; stop, slow down, or speed up flow of time"
2-Space Gem: "Travel anywhere you want, mostly through teleportation"
3-Soul Gem: "Attack, Steal or Manipulate souls. Also, grants access to a pocket dimension"
4-Reality Gem: "Manipulate, and control reality, similar to a Cosmic Cube"
5-Power Gem: "Vastly increases strength and durability, and allows energy manipulation"
6-Mind Gem: "Greatly increases mental abilities, and grants the powers of telepathy and telekinesis"
Please note you would only have as much control over the Gem as a person using it for the first time would have.