Pendulum Effect
You cannot Pendulum Summon any monsters, except 'DD' monsters (this effect cannot be negated). During each of your Standby Phases: Increase this card's Pendulum Scales by 2 (max. 10), then destroy all monsters you control whose Levels are lower than this card's Pendulum Scales, except 'DD' monsters.
Monster Effect
During either player's turn: You can discard this card, then target 1 'DD' card or 1 'Contract Book' card you control; return that target to the hand. You can only use this effect of 'DD Magical Sage Galilei' once per turn.