This page notes details of D/D/D Supersight King Zero Maxwell (DARK/Fiend/Pendulum/Effect Monster) : decks, tips, effect and rulings. Learn and enjoy playing Yu-Gi-Oh! Duel Links!
Pendulum Effect You can target 1 face-up monster on the field; change its DEF to 0 until the end of this turn (even if this card leaves the field). You can only use this effect of "D/D/D Supersight King Zero Maxwell" once per turn.
Monster Effect Before damage calculation, if this card attacked an opponent's Defense Position monster: You can change the DEF of the opponent's monster to 0 until the end of the Damage Step. If this card attacks a Defense Position monster, inflict piercing battle damage to your opponent. You take no battle damage from attacks involving this card.
Pendulum Effect
You can target 1 face-up monster on the field; change its DEF to 0 until the end of this turn (even if this card leaves the field). You can only use this effect of "D/D/D Supersight King Zero Maxwell" once per turn.
I think you can still increase its ATK again. There's a similar ruling for the Reptilianne archetype:
https://yugioh.fandom.com/wiki/Card_Rulings:Reptilianne_Gorgon#cite_note-ReptGorgon-Shrink-5
"If a monster's ATK is 0 because it battled with "Reptilianne Gorgon" and then it is equipped with an Equip Spell Card, then the monster's ATK is increased from 0"
Reptilianne Gorgon's effect doesn't specify any duration (e.g. until the end of the turn). The ATK of any monster it attacked can still be increased afterwards.
This one and Clausolas says "until the end of this turn"
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