Ok, so i managed the "Matrix effect". I used the FOR looping, but i used less times in the command, and i stack the command so it went a bit slower. Like this:
FOR /L %%i IN(1,1,20) DO echo %random%....
FOR /L %%i IN(1,1,20) DO echo %random%....
FOR /L %%i IN(1,1,20) DO echo %random%....
FOR /L %%i IN(1,1,20) DO echo %random%....
etc.
Thanks for helping guys!