MYSTERY COLLABORATION?? SiIvaFes

MYSTERY COLLABORATION?? || SiIvaFes was a name sometimes given to fusion collabs pre-premiere during the SiIvaSummer All-Star Festival event.
There are two videos which are known to have originally had the title "MYSTERY COLLABORATION?? || SiIvaFes":
*We Are Number One but it's a Fusion Collab
*Great Days Fusion Collab