I don't know if i'm just getting bad luck or what but I don't think getting more than 2 or 3 at most of UR evo cards is going to happen even if u farm it every day for whole event. THe ghosts just do not seem to drop often enough to be able to support 300 of them for one trade. I currently have 52 ghosts 15 pumpkins and 12 witch hats after clearing the whole thing, and that is including the bonuses you get. So I really do not see how you can possibly collect enough for the UR cards to be the main focus. The sword looks way too powerful to pass up even for non Kenshin generals, adding an additional attack to every general would be so incredibly powerful. And as previous posters have said you can get UR cards from other sources, and this seems to be one of the best weapons in the game and not able to be gotten elsewhere.