Advanced format ruling
Chimeratech Fortress Dragon
Card effect (current official text)"Cyber Dragon" + 1+ Machine monsters
Cannot be used as Fusion Material. Must first be Special Summoned (from your Extra Deck) by sending the above cards from either field to the GY. (You do not use "Polymerization".) The original ATK of this card becomes 1000 x the number of Fusion Materials used for its Special Summon.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.