ValiTools node collection: VSmartPrompt (Dynamic Prompts with rich-text editor, reusable variables, switcher conditions, chaining inputs and post-run selection highlighting), VFileRandom (no-repeat random image loader) and VRandomSelector (lazy random passthrough of N same-type inputs) and VWaitForVRAM (hold execution until enough VRAM is free).
https://github.com/vangel76/comfyui-ValiTools
git clone https://github.com/vangel76/comfyui-ValiTools
comfy node install valitools