Choose left or right. Starting with you and proceeding in the chosen direction, each player chooses a creature controlled by the next player in that direction. Each player gains control of the creature they chose.
All players will gain control of the creatures they chose simultaneously.
If the next player in the chosen direction controls no creatures, you won’t gain control of anything.
It doesn’t matter whether the next player is a teammate or an opponent.
Order of Succession doesn’t target any players or creatures. You can choose and gain control of a creature with protection from blue, for example.