Edison format ruling
Decoy Dragon
Card effect (current official text)If this card is targeted for an attack: Target 1 Level 7 or higher Dragon-Type monster in your Graveyard; Special Summon it, and if you do, change the attack target to it and perform damage calculation.
Rulings
- Decoy Dragon's effect is activated during the Battle Step when it is selected as the target for your opponent's attacking monster.
- Decoy Dragon's effect does not cause a replay.
- Decoy Dragon must be face-up at the time it is declared as the target of your opponent's attacking monster or its effect will not activate.
- If you have a Decoy Dragon equipped with Ring of Magnetism and your opponent's monster declares an attack against it, the effect of Decoy Dragon is still activated and your opponent's attacking monster must still battle with the Level 7 or higher Dragon-Type monster that you Special Summon from your GY.
- If the Level 7 or higher Dragon-Type monster has an effect that activates when it is Special Summoned, the effect will begin a new Chain after it is Special Summoned by Decoy Dragon. Example: If you Special Summon Felgrand Dragon by using Decoy Dragon's effect, the effect of Felgrand Dragon will activate and it will be able to gain ATK.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Edison forum — sourced change requests get reviewed.