Number 89: Diablosis the Mind Hacker: banish face-down from the Extra Deck

Card text

2 Level 7 monsters Once per turn: You can detach 1 material from this card; look at your opponent's Extra Deck and banish 1 monster from it, face-down. At the end of the Battle Phase, if this card destroyed a monster by battle: You can target 1 card in your opponent's GY; banish it, face-down. If a card your opponent owns and possesses is banished face-down while you control this card (except during the Damage Step): You can banish cards from the top of your opponent's Deck, face-down, equal to their face-down banished cards. You can only use this effect of "Number 89: Diablosis the Mind Hacker" once per turn.

Attribute

DARK

Type

Psychic

Rank

ATK

2800

DEF

1200

Explained

What it does

A Rank 7 Xyz. Once per turn, detach 1 to look at your opponent's Extra Deck and banish 1 monster face-down. After destroying a monster by battle, banish a card from their GY face-down. When their cards are banished face-down, banish that many from the top of their Deck.

Play it when

It can't be used in Advanced Format. It's Forbidden in the TCG.

Common mistakes

Using the Deck banish in the Damage Step. You can't.

Status: Forbidden in the TCG (Sept 21, 2026 list), so it can’t be used in Advanced Format.

How it works

Materials: 2 Level 7 monsters.

Ignition (once per turn): Detach 1 material; look at your opponent’s Extra Deck and banish 1 monster from it, face-down.
End of the Battle Phase: If this card destroyed a monster by battle, target 1 card in your opponent’s GY; banish it face-down.
Trigger (once per turn): If a card your opponent owns and possesses is banished face-down while you control this card, banish cards from the top of their Deck face-down equal to their face-down banished cards. Not in the Damage Step.

Rulings in plain English

Extra Deck banish: Detaching is the cost.

GY banish: Activates in the Battle Phase’s End Step and targets.