Minecraft – Coven Witches Constantly Teleporting

Here is a method I came up with while pondering your question, be warned though, I haven't had a chance to test it out, but I think it might work. Here are the commands and command block setup:

1: /testfor @e[type=snowball]
2: /execute @e[type=snowball] /tp @p <x> <y> <z>
3: /setblock ~ ~ ~ redstone_block 0 destroy

Remember to put numbers next to the ~ symbols to tell the command where to place the redstone block relative to the command block so it's constantly running the command in the next command block. Now here's the setup, please note that being able to to what I am telling you to do does require basic command and redstone knowledge:

1 = command block #1
2 = command block #2
3 = command block #3
[] = redstone comparator
{} = redstone repeater with a 2 tick delay
# = redstone block

3#1[]{}2

Also, you might want to run this command as to not lag your server:

/gamerule doTileDrops false

I also forgot to mention, you must be playing in snapshot 14w21a or later.

Registered usernames can not include spaces. As commands in Minecraft use space as a separator for arguments, they will take "Sentinel" as the name for the player to search for, and then "Gaming" as the second argument (such as x-coordinate or item) and budge everything over. This will cause an error.

If you are on a server or using some kind of plugin/mod that allows you to change your name, you should type your actual account name rather than your set nickname.

If you are using a cracked/pirated version of Minecraft, stop.

If your name contains an underscore ( _ ), make sure you are typing that rather than a space.

As an alternative to typing your name, you could use @p. For example:

/tp @p -419 43 356 

This will target the closest player (which will be the person executing it), and is also shorter than typing/tabbing out your name.