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Don't use this.

It breaks color when pasting and doesn't seem to work with Violentmonkey.

For rainbow text, you can use the rainbow text script at /guest1052world

For drawing, you can use the MS-Paint script at /poopman under ART (6)

For pasting, you can just run Permissions.can_paste = function() {return true;}; in console

For teleporting, you can run javascript:w.goToCoord;positionX=XCORDHERE;positionY=YCORDHERE in the URL bar, replacing XCORDHERE and YCORDHERE with the X and Y coordinates of the place you want to be. Be aware that you have to type javascript: first manually before pasting this because browsers will remove that part if you just paste it

And for executing code, you can just use your browser's console
The console in chrome/chromium based browsers can be found at ︙ ➜ More tools ➜ Developer Tools or by right clicking and choosing Inspect.
The console in firefox can be found at ☰ ➜ More tools ➜ Web Developer Tools or by right clicking and choosing Inspect (Q̲)