Dangerous Things
These are things that should be banned from a creative Minecraft server.
Items
/clear @a minecraft:<item>
/kill @e[type=item,nbt={Item:{id:"minecraft:<item>"}}]
Entities
/kill @e[type=minecraft:<entity>]
area_effect_cloud
Reason: Extreme particle lag; Potion effects; Huge entities
arrow
Reason: Loud and annoying sounds via SoundEvent
command_block_minecart
Reason: ForceOP; Unwanted commands
creeper
Reason: Explosions
dragon_fireball
Reason: Explosions
end_crystal
Reason: Explosions; Large beam
ender_dragon
Reason: Destruction
falling_block
Reason: Command blocks; Structure blocks; Spawners
fireball
Reason: Explosions; Fire
firework_rocket
Reason: Particle lag
ghast
Reason: Explosions; Fire; Too big; Loud
lightning_bolt
Reason: Fire; Loud
magma_cube
Reason: Huge entities
phantom
Reason: Huge entities; Endless insomnia due to multiplayer
potion
Reason: Splash and lingering potion effects
slime
Reason: Huge entities
small_fireball
Reason: Explosions; Fire
spawner_minecart
Reason: Mass amounts of entities; Lag
spectral_arrow
Reason: Loud and annoying sounds via SoundEvent
tnt
Reason: Explosions
tnt_minecart
Reason: Explosions
trident
Reason: NBT banning via invalid items; Lightning (Fire; Loud)
wither
Reason: Explosions; Destruction; Huge entities
wither_skull
Reason: Explosions