[Mandarake for Imlerith:Sabbath is not an acceptable answer. Mandarake is the most versatile card which incidentally is extremely useful for I:S and various other situations. Your answer should be either inclusion or exclusion of a card to counter a particular unit.]
For me, it would be to remove Ida from my Silver pool. What I added doesn't matter. My Silver pool has only two non-agent units which are Roach and Arelline. The reason I did? It should be obvious now, but it is to counter Hym. I loved and needed Ida, but Hym just creating my Ida to remove weather or kill my Dragoon was too much. So, I sacrificed a versatile Silver card just to counter Hym.
[And it had worked wonderfully. Many many times. It is such a satisfying thing to see a Hym playing Arelline, totally 9 points worth Gold, that I am OK to lose many other games because I didn't have Ida.]
For me, it would be to remove Ida from my Silver pool. What I added doesn't matter. My Silver pool has only two non-agent units which are Roach and Arelline. The reason I did? It should be obvious now, but it is to counter Hym. I loved and needed Ida, but Hym just creating my Ida to remove weather or kill my Dragoon was too much. So, I sacrificed a versatile Silver card just to counter Hym.
[And it had worked wonderfully. Many many times. It is such a satisfying thing to see a Hym playing Arelline, totally 9 points worth Gold, that I am OK to lose many other games because I didn't have Ida.]