Stats (per in-game day): ~ 2 Wither skulls.
Find a 4-way corridor inside a nether fortress.
2. Remove the corners to expand the surface area of the corridor to make it 5x5
3. Place a cauldron in the centre and a solid block 3 blocks above the cauldron.
4. Lure a piglin inside the cauldron with gold and quickly place a slab block under your floating block to trap him inside. (use the stairs only if the piglin is not responding to the gold.)
5. Break the floating block (optional but recomended) and then dig a 5x5, 3-block-deep hole.
6. Under the cauldron, place a chest and cover the bottom of the hole with hoppers leading to the chest. (highly recomended to use one of my hopper paths)
7. Place trap doors around the rim of the hole like in the image below. That will make the Wither skeletons think that its a solid block and trick their A.I into thinking they have a clear path towards the piglin making them fall into the pit. Then just lowkey slime them and you're done.