The problem with bomb, its that cost 4 provisions and just destroy the artifact. So when he uses scenario and you destroy it, he has still + 4 points in that movement. In final rounds its important everypoints u could get. Thats why i use bomb heaver. It cost only one more provision than dimeritium bomb but give you + 4 and also you can find it using Royal decree (another must card)
Problem is, if you're stuck with this card the last round and there is no scenario, chances is this card will lose you the game as a 4 point card. Having it in deck or at hand is not really a good thing, unless there is a scenario. The design is that annoying.
I've been experimenting with Triss as an alternative solution, adding dancing star, northern wind and lacerate as "options". But this is not really the solution either. And drawing dancing star at hand is postively worse than bomb heaver.