How to make mobs fight anything (and each other) without mods in Minecraft

Here's how to make mobs hostile in Minecraft with the help of commands. You can make mobs fight each other in Minecraft without any mods or you can make them attack anything by tricking them into believing that they were attacked first.

Here are the commands:
1. Summon Potion
/summon minecraft:potion 167 67 -49 {Potion:{id:"minecraft:splash_potion",Count:1,tag:{Potion:"minecraft:healing"}}}

or

/summon minecraft:potion 167 67 -49 {Potion:{id:"minecraft:splash_potion",Count:1,tag:{Potion:"minecraft:harming"}}}





FOR 1.16 AND ABOVE ONLY:


2. Change UUID

/data modify entity @e[type=snowball,limit=1] Owner set from entity @e[type=minecraft:armor_stand,limit=1] UUID
Thanks D M for providing the command for 1.16



FOR 1.15 AND BELOW ONLY:
2.1 Change Least UUID
/data modify entity @e[type=potion,limit=1] owner.L set from entity @e[type=minecraft:armor_stand,limit=1] UUIDLeast

2.2 Change Most UUID
/data modify entity @e[type=potion,limit=1] owner.M set from entity @e[type=minecraft:armor_stand,limit=1] UUIDMost

Change the entity selectors and target location to suit your world, I made it as simple as I could so you can understand it better, but it's not good for real world usage as you might affect other entities due to the scope being too broad.

CrushedPixel already made this for older versions of Minecraft, this was discovered by FVDisco. And I basically remade the commands from scratch based on the same idea since the old commands go so outdated by all the constant changes to the command system in Minecraft that it was easier to start over. If you are still running an old version of Minecraft, use these commands instead: youtube.com/watch?v=dGBDKY_6srk&list=PLIRR9…


Experimental arrow command (doesn't work, help me figure it out!):

summon minecraft:arrow 167 67 -49

data modify entity @e[type=arrow,limit=1] OwnerUUIDLeast set from entity @e[type=minecraft:armor_stand,limit=1] UUIDLeast

data modify entity @e[type=arrow,limit=1] OwnerUUIDMost set from entity @e[type=minecraft:armor_stand,limit=1] UUIDMost


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