[Pendulum Effect]
During your Main Phase: You can add 1 face-up "D/D" Pendulum Monster from your Extra Deck to your hand. You can only use this effect of "D/D Savant Thomas" once per turn.
[Monster Effect]
You can target 1 "D/D" card in your Pendulum Zone; any battle damage your opponent takes becomes halved for the rest of this turn, also destroy that card, and if you do, Special Summon 1 Level 8 "D/D/D" monster from your Deck in Defense Position, but its effects are negated this turn. You can only use this effect of "D/D Savant Thomas" once per turn.