When you take 3000 or more Battle Damage from 1 attack, you can activate this card. Remove all monsters in each player's Deck and Graveyard from play.
Rulings
Individual Card FAQs
If you attack "Blue-Eyes White Dragon" with "Ojama Green" or some other 0 ATK monster, you can activate "Inferno Tempest" after damage calculation. Then "Ojama Green" is sent to the Graveyard after "Inferno Tempest" resolves.
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