This is a grinder for any mob but the structure was added on due to the fact I used it and played on a Minecraft skyblock server called LegacyMC (IP address is play.legacymc.org for java edition only).
What I did was I got scafidi454's schematic of the Iron Golem farm, and instead of putting redstone and command blocks there I replaced it with spawners.
On top the quartz structure there are spawners there, along with a sell portal at the bottom of the quartz structure. However, the sell portal is only exclusive to LegacyMC.
Credits to scafidi454 for the idea of this schematic