Perfect Datapack, put you in spectator after die, check if your death count is up to one, and put again, prevents spectator to generate chunks, but don't hide any commands! Simple, Funny and Complete!
Programed by Gufler, Idealized and Roterized by PedroMagnoBR
If you wanna complete hardcore experience, download the texture pack made for that datapack in 4 languages! Avaliable for Faithful too! https://www.curseforge.com/minecraft/texture-packs/hearts-and-specs