Council of Elrond

CoE Digest #12 wrote:9. So You've Come Back

The card states it can't be duplicated on a given company. Originally, the
opponent has two separate companies and SYCB is played on a character in each of the two companies (a legal play). The two companies meet at a haven and join. Now there are two characters in one company with SYCB. What happens? Is it:

a. One must be discarded, and the player controlling the characters decides which one is discarded
b. One must be discarded, and the hazard player decides which one
c. Neither is discarded, the effects simply aren't duplicated on the company

I lean toward (c) because they were both legal when played and there's
nothing stating that they should be discarded. [The player affected insisted on (a).]

*** The answer is b.

CRF, Errata(Cards), So You've Come Back wrote:If two companies join, and both companies have a So You've Come Back played on them, the hazard player chooses which one to discard. A character in a company with just allies is by himself for the purposes of this card.

Lidless Eye, Starter Rules, Characters & Companies wrote:Note: Sometimes two or more companies combine and the resulting company has two or more of the same cards that say: "cannot be duplicated on a given company." When this happens, immediately discard all but one of those cards (your choice).