Nimits' Craftable Spawners n' Eggs
Allows you to get mob spawn eggs, and Spawners!
This will generate mobs forever.
It is a shapeless crafting that costs 1 Soul Sand, 1 Amethyst. It later must be heated in a furnace.
This can be right clicked on a mob to harm them. However if failed to kill the mob you will not collect their spawn egg.
The mob's spawn egg can be right clicked on a Mob Spawner to set it. It cannot be undone. The Egg does not drop, it appears in your inventory.