It should be good to add a confirmation check for the creature to be sacrificed to Daemogoth Woe-Eater triggered ability. I had bot the Daemogoth and Kianne in play during a draft: when the ability triggered at the start of my upkeep, asking me to sacrifice a creature, I clicked on Kianne to generate a Fractal token to sacrifice. Apparently this cannot be done unless in full control, so my Kianne was sacrificed immediately. It should be good to add an "are you sure" passage to check if we really want to sacrifice a particular creature.