DDD Kyokuchioh Chaos Apocalypse / D/D/D Great Wise King Chaos Apocalypse (note: it’s a pun on kyokuchou, “bureau director”.)
Dark Fiend / Pendulum / Effect
PS4 LV7 2700/2000
Pendulum Effect:
(1) You can banish 2 “D/D” monsters from your Graveyard; Special Summon this card from your Pendulum Zone.
Monster Effect:
You can only use the monster effect of “D/D/D Great Wise King Chaos Apocalypse” once per turn.
(1) During your opponent’s turn, if this card is in your hand or Graveyard: You can target 2 face-up Spell/Trap Cards you control; destroy them, and if you do, Special Summon this card, but you cannot Special Summon monsters for the rest of this turn, except Fiend-Type monsters.

DDD Kokuryuuoh Beowulf / D/D/D Cruel Dragon King Beowulf
Dark Fiend / Fusion / Effect
LV8 3000/2500
1 “D/D/D” monster + 1 “D/D” monster
(1) If a “D/D” monster you control attacks a Defense Position monster, inflict piercing battle damage to your opponent.
(2) During your Standby Phase: You can destroy all cards in the Spell & Trap Zones.

DD Madou Kenja Newton / D/D Magical Astronomer Newton
Dark Fiend / Pendulum / Effect
PS10 LV7 0/0
Pendulum Effect:
(1) You cannot Pendulum Summon monsters, except “D/D” monsters. This effect cannot be negated.
(2) Before resolving the effect of a Trap Card that would inflict damage to you, you can negate that effect, then destroy this card. This effect can only be used once while this card is in the Pendulum Zone.
Monster Effect:
You can only use the monster effect of “D/D Magical Astronomer Newton” once per turn.
(1) Discard this card, then target 1 “D/D” card or “Dark Contract” card in your Graveyard, except “D/D Magical Astronomer Newton”; add it to your hand.

DD Madou Kenja Copernicus / D/D Magical Astronomer Copernicus
Dark Fiend / Pendulum / Effect
PS1 LV4 0/0
Pendulum Effect:
(1) You cannot Pendulum Summon monsters, except “D/D” monsters. This effect cannot be negated.
(2) Before resolving the effect of a Spell Card that would inflict damage to you, you can negate that effect, then destroy this card. This effect can only be used once while this card is in the Pendulum Zone.
Monster Effect:
You can only use the monster effect of “D/D Magical Astronomer Copernicus” once per turn.
(1) If this card is Normal or Special Summoned: You can send 1 “D/D” card or “Dark Contract” card from your Deck to the Graveyard, except “D/D Magical Astronomer Copernicus”.