Poisoning chickens is now obsolete. This incredibly simple farm takes seconds to build and is nearly self-sustaining, consuming only the durability of shears to make wither roses at a rate of about a stack every 80 seconds.

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Ender Dragon Trap:    • Minecraft Elegance: Ender Dragon Deat...  
Wither Skeleton Farm:    • Minecraft Elegance: Instant Wither Sk...  

0:00 Intro
0:36 Materials
0:45 Mechanics
2:23 Build Tutorial
4:23 Instructions for Use
7:27 Fast Pumpkin Carving, 2 repeaters at full delay

NOTES
4:50 Some modified servers like PAPER are configured with dimension-specific difficulty settings, so the End dimension may be in easy difficulty, even if other dimensions are set to normal or hard. This will prevent the farm from working correctly.
5:29 Hopper minecarts can be added to automate collection of snowballs and wither roses, but you need to have snowballs in inventory in order to craft them into snow blocks. Jumping into the chamber is a very easy way to quickly get the snowballs into inventory while also collecting the wither roses.
6:48 The lifespan of shears can be quadrupled with Unbreaking 3. It's up to you whether it is worthwhile to save 6 iron ingots this way.