If you portal rescue a unit you control but do not own (e.g., via Possession), whose base does it go to and who controls it?

Ruling: The unit goes to its owner's base, and the owner plays it and gets the "when played" effect.

Sequence:

• When Portal Rescue targets a unit you control but don't own, the unit goes to its owner's base (not yours)
• The owner of the unit plays it
• The owner gets the "when played" trigger

Nuances:

• This is clarified in the errata for Portal Rescue
• Rule 107.5d states that a card owned by a player can never be put into the banishment of another player; if it would be, it goes to its owner's banishment instead