Since plots are considered in play, can you give plots traits with the Copper Link? If you can, will the plot retain the trait in the used pile if a new plot is revealed in the same phase?

Crevic said:

Plots aren't really considered to be "in play." They are considered to be in the plot deck, "revealed," and in the used pile. Revealed plots are never actually said to be "in play." They can affect cards that are in play, despite not being in play themselves, because the nature/rules for plot cards specify that they do - primarily by not making sense under any other interpretation.

So unless a card specifically interacts with plot cards, it will not. Copper Link cannot give a trait to a plot.

Crevic said:

This question is actually contradictory to your first. If the revealed plot card was considered to be "in play," then plots in the used pile would NOT be considered "in play." Otherwise, the text on plots like Power of Blood would be active even if they were not the revealed plot. So if the plot goes to the used pile (by a new plot being revealed), it would be like discarding a card from play - and it would lose the trait.

So, you cannot use Copper Link to give a random plot the "City" trait in the first place. Even if you could, revealing a new plot during the same phase would not give you an extra "City" plot in your used pile for the resolution of the new plot's "when revealed" effect. (Just guessing that's what someone is trying to do here....)

Yeah, City plots was the idea, it just popped in my head the other day. Wasn't sure if it was even legal. Thanks for the explanation!