I was goofing around on training mode with Marth (I'm trying to pick up the character) and I discovered a combo. If you position it right, mid-hit dair can combo into tipper fsmash at around 20 or 30 on most characters. I don't know when this would be applied, but I'm thinking as a tech chase, especially near the ledge because then if you can get the spike hitbox on the dair it could ko early. keep in mind this is a theory and I'm not sure if this combo will be useful at all. Also it may be possible to DI out of this combo. I will update this thread if I find anything else out. 