Giant Mushroom Mob Generator -- With a couple stacks of dirt and bonemeal, and about 20 minutes, you can build your own high-throughput mob generator [Video in Comments] : r/Minecraft
Monster Spawner Generator (Java Edition 1.19)
How to make an obsidian generator in minecraft 1.14 - YouTube
Minecraft : Summon Mob Generator : Gamer Geeks
Minecraft online mob spawner and /summon command generator
How to Make a Mob Spawner in Minecraft (with Pictures) - wikiHow
Monster Spawner – Minecraft Wiki
Dungeon Generator Command Block - 9Minecraft.Net
How To Make A Cobblestone Generator In Minecraft | Tech Insider - YouTube