In this thread, I suggest a power from the list and you reply with what you would do with it. It will change daily. For the purposes of this question though, it is assumed you have it for life.
Feel free to make your own version of this thread, but with you choosing the powers.
Today's power (until midnight tonight) is Omnipotent Power Mimicry*.
Here what I would do, listed by days after acquisition:
1) Select Power Backup Ability*. This will make a copy of itself and Omnipotent Power Mimicry*.
2) The backup of Power Backup Ability* will manifest itself, and begin to make another copy of Omnipotent Power Mimicry* and itself. I select another power (e.g. Teleportation), which gets that backed up too.
3) This day, I retain Omnipotent Power Mimicry*, acquiring Teleportation again and keeping Power Backup Ability*. I select another power, then wash, rinse an repeat to get any power I want.
If that fails, then Power Backup Ability* will only backup itself, then revive itself the following day. On that day, it will backup Omnipotent Power Mimicry* as long as I do not select a second power. I can then use it to keep all following powers.
That's one of the reasons why Omnipotent Power Mimicry * has always been one of my favorite powers. It was my fourth power too.