30° 12′ 38″ N, 95° 45′ 2″ W
You can't rob Peter, Paul and Mary to pay yourself.
Each power card should have "Keep" or "Discard" written on them. Keep the ones that say keep. Discard the ones that say discard.
But they get played immediately on the turn they are purchased, i.e. you follow the instructions on them immediately?