Mathmech Diameter (ROTD-EN028)

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.

Cyberse / Tuner / Effect, Rise of the Duelist