D/D Savant Copernicus

Pendulum Effect

You cannot Pendulum Summon monsters, except "D/D" monsters. This effect cannot be negated. Once, while this card is in your Pendulum Zone, you can negate an activated Spell effect that would inflict damage to you, then destroy this card.

Monster Effect

If this card is Normal or Special Summoned: You can send 1 "D/D" or "Dark Contract" card from your Deck to the GY, except "D/D Savant Copernicus". You can only use this effect of "D/D Savant Copernicus" once per turn.