Why does Dakuan use this specific poison in Ninja Scroll?

Why does Dakuan use this specific poison in Ninja Scroll? - Full body of young focused Asian male in casual wear sitting on bench in park and browsing internet on tablet

In the movie Ninja Scroll (1993), Dakuan (the little old man) poisons Jubei to force him to help his plans. Later it is revealed that the poison can be cured only by the poison that is in Kagero (the poison lady). I really didn't understand that plot point. What was the point of using such a specific poison? Did Dakuan not anticipate them actually meeting Kagero and wanted Jubei to die in the end?






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The Only Cure To Heal This Poisoned Ninja Is To Have S3x With Her I Anime Recap




Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Armin Rimoldi, Armin Rimoldi, Tom Fisk, Egor Kamelev