Tengu format ruling
Volcanic Doomfire
Card effect (current official text)This card cannot be Normal Summoned or Set. This card can only be Special Summoned by sending a face-up "Tri-Blaze Accelerator" you control to the Graveyard. During your opponent's Battle Phase, your opponent must attack this monster with any Attack Position monsters they control. When this card destroys a monster and sends it to the Graveyard, destroy all monsters your opponent controls and inflict 500 damage to your opponent for each monster destroyed by this effect.
Rulings
- This card can be Special Summoned from the GY, as long as it was properly Special Summon first, and then sent to the GY.
- Monster Tokens destroyed by this card’s effect "…destroy all monsters your opponent controls and inflict 500 damage to your opponent for each monster destroyed by this effect" count as monsters, and 500 damage will be inflicted per Token.
- This card’s effect "When this card destroys a monster and sends it to the GY…" only activates when this card destroys a monster by battle.
- If you control Volcanic Doomfire and another monster equipped with Ring of Magnetism, all your opponent's monsters must declare an attack, and the attack target for all of them will be changed to the monster equipped with Ring of Magnetism.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.