As a wishcrafter, nothing has been more effective for the 13th level twisted wish feature (-4 on saves if they asked for it) than bestow curse. In fact, bestow curse probably saw more use with that than all other spells combined. It requires creative applications of their wish or desire. For example:
Me: "Can't we talk this over? I'm a merchant, what do you want?"
Monster: "I want to eat all of you."
Me: "Your wish is my command." (bestow curse, -4 penalty on attack rolls, saving throws, and skill checks from intense bloating as if its gullet was simultaneously crammed with the entire party's mass)