REDU format ruling
Ghost Gardna

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)When a face-up monster you control is selected as an attack target, you can change the target to this card. When this card is destroyed and sent to the Graveyard, 1 face-up monster your opponent controls loses 1000 ATK, until the End Phase.
Rulings
- Ghost Gardna's second effect targets 1 of your opponent's monsters.
- If a Ghost Gardna in your hand or Deck is destroyed and sent to your GY, its effect activates.
- If you control a face-up Marauding Captain and Ghost Gardna, when your opponent attacks Marauding Captain you can activate Ghost Gardna's effect, and the opponent's monster will attack Ghost Gardna instead.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.