Adromischus cristatus “Crinkle-Leaf Plant”

12/31 Update: I took this leaf from my mom’s plant in Summer (?) 2018, and it’s been slowly propagating since. The original leaf is surprisingly long-lived, 1.5 years later and it still hasn’t deflated. The plant is in 100% Bonsai Jack mix, which I have feel dries out way too quickly. That being said, the plant looks fine, I just have to remember to keep up with fertilizer.