Mathmech Diameter is a Common Tuner Monster card from Yu-Gi-Oh! (Rise of the Duelist, ROTD). Current market price: $0.30.
Common
Rise of the Duelist (ROTD)
Card Text
When this card is Normal Summoned: You can target 1 Level 4 Cyberse monster in your GY; Special Summon it, but it cannot activate its effects. A "Mathmech" monster that was Synchro or Xyz Summoned using this card on the field as material gains the following effect.
● Once per turn, during the turn this card was Special Summoned, when your opponent activates a card or effect (Quick Effect): You can negate that effect.
You can only use each effect of "Mathmech Diameter" once per turn.
