Halloween
Smash Cadet
It doesn't have to be a legitimate combo, nor does it have to do alot of damage. It's gonna relieve some pressure off of you, so you can go on the offense, and an offensive, well- spaced marth is pretty nasty.=S Follow up on a Counter? It's not a legitimate combo. It's really just seven damage, woohoo.
Plus Counter isn't that fast. I'd much rather just hit them with something.
What do u mean counter isn't fast? It does have some lag, but it catches people off guard most of the time, and you can follow up with a tech chase just like sveet said. Overall this is a good move, and shouldn't be overlooked.