If you put the +1 Card token on Patrician/Emporium, then BOTH cards get +1 Card, since they're both from the same supply pile.
But what about Encampment/Plunder?
Pathfinding says "Move your +1 Card token to an Action Supply pile (when you play a card from that pile, you first get +1 Card)."
Is Encampment/Plunder an action supply pile? Or is it only an action supply pile as long as Encampments are on top? And once you put your +1 Card token on it, does playing a Plunder during your treasure phase still draw a card? One the one hand, it almost feels like it needs Errata. On the other hand, it happens to be worded exactly right to make the coolest possible thing happen without being broken.