D/D Savant Kepler - MAMA-EN053 - Ultra Rare

[ 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.
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[ 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.