The Draught of Living Death was a powerful sleeping potion that could plunge its drinker into a deathlike slumber, which was why it also bore the name "Water of Life and Death."
This meant that, from the moment they fell asleep until they awoke, the drinker underwent a process akin to "returning from death to life," indicating that the Draught of Living Death possessed the magical property of "rebirth."
Among the ingredients involved in an Animagus potion, "dew that has not come into contact with sunlight or living creatures for seven days" was an important component and likewise possessed the magical property of "rebirth."
Wizet used the magical property of "rebirth" as his point of breakthrough, first improving the Draught of Living Death so that it could replace "dew that has not come into contact with sunlight or living creatures for seven days."
He removed the Valerian root from the Draught of Living Death, allowing the Sopophorous Bean's magical property of "forgetting" to affect the soul, thereby deceiving the Animagus magic.
This made it possible to improve the Animagus potion through an improved Draught of Living Death.
After taking the improved Animagus potion, a wizard could cast a certain kind of magic while in Animagus form, depending on their particular Animagus.
This was how Wizet used the Draught of Living Death. In contrast, Voldemort had demonstrated another application of it through his practice of the Flight Charm.
What Wizet valued about the Draught of Living Death was the magical property of "rebirth" derived from the process of "returning from death to life."
In Voldemort's treatment of the Draught of Living Death, what he valued more was the potion's inherent effect of "returning from death to life."
Making use of the Ashwinder's unique nature, he nurtured the "Voldemort-in-a-bottle" again and again.