When your opponent activates a monster effect, while you control a Synchro Monster that lists a Synchro Monster as material: Negate the activation, also, after that, Set this card face-down instead of sending it to the GY. You can only activate 1 "Scrap-Iron Signal" per turn.
Near Mint / Lightly Played Unlimited - $0.50
Moderately Played Unlimited - $0.50
Heavily Played Unlimited - $0.50
Damaged Unlimited - $0.50
Near Mint / Lightly Played 1st Edition - $0.50
Moderately Played 1st Edition - $0.50
Heavily Played 1st Edition - $0.50
Damaged 1st Edition - $0.50