Pendulum Effect: You cannot Pendulum Summon monsters, except "D/D" monsters. This effect cannot be negated. Once per turn, during your Standby Phase: Reduce this card's Pendulum Scale by 2 (min. 1), then destroy all monsters you control with a Level greater than or equal to this card's Pendulum Scale, except "D/D" monsters.
Monster Effect: If this card is Normal or Special Summoned: You can activate 1 of these effects. You can only use this effect of "D/D Savant Kepler" once per turn.
- Target 1 other "D/D" card you control; return it to the hand.
- Add 1 "Dark Contract" card from your Deck to your hand.