You can target 1 face-up monster on the field; you cannot Special Summon monsters from the Extra Deck for the rest of this turn, except Cyberse monsters, also Special Summon this card from your hand (but it cannot attack this turn), and if you do, the targeted monster gains 1000 ATK until the end of this turn. You can only use this effect of "Mathmech Addition" once per turn.
NM-Mint 1st Edition - $0.70
Lightly Played 1st Edition - $0.60
Moderately Played 1st Edition - $0.60
Heavily Played 1st Edition - $0.50
Damaged 1st Edition - $0.40
NM-Mint 1st Edition Non English - $0.70
Lightly Played 1st Edition Non English - $0.60
Moderately Played 1st Edition Non English - $0.60
Heavily Played 1st Edition Non English - $0.50
Damaged 1st Edition Non English - $0.40