Assault on GHQ

 GHQ stands for Goblin Headquarters.

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The monsters featured on Assault on GHQ from the foreground inwards are Marauding Captain and Goblin Attack Force. On the bottom left quadrant of the artwork, the rations from Emergency Provisions can be seen.

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This is perhaps a reference to the trap, Prepare to Strike Back, where Marauding Captain is seen running towards Goblin Attack Force, who are readying for battle.

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OCG Rulings

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This card cannot be activated during the Damage Step.: Assault on GHQ

This card target

Destroying the targeted monster and sending cards from the opponent's Deck to the Graveyard are not considered to happen simultaneously.

This card cannot be activated if your opponent has 1 or less cards in the Deck.

Previously Official Rulings

If you cannot destroy a monster with this effect, you cannot send cards from your opponent's Deck to the Graveyard.

If you destroy "Peten the Dark Clown", you miss the timing on its activation because it was not the last effect to resolve, so you cannot Special Summon another "Peten the Dark Clown".

Charmer: If the turn player controls a “Charmer” and a monster controlled by its effect, and activates “Assault on GHQ” and targets the controlled monster, and the opponent chains an effect to destroy the “Charmer”, the controlled monster returns to the opponent’s control, but is still destroyed by the effect of “Assault on GHQ”.