[offsetx=10]offset text on X axis (useful for animated effects)[/offsetx]
[offsety=10]offset text on Y axis[/offsety]
why they don't work and why the text doesn't shake
An offset by itself doesn't make anything shake. You need to set it with and without an offset over time to make it appear to shake.
Develop games in your browser. Powerful, performant & highly capable.
And how to do it then?
Give it a boolean instance variable, offset. Every tick, if offset is true, set offset to false and set the text without bbcode. In the following event, use the Else condition and set offset to true, and set the text with the offset bbcode.