Goat format ruling
Inferno

Card effect (current official text)Cannot be Normal Summoned/Set. Must first be Special Summoned (from your hand) by banishing 1 FIRE monster from your GY. If this card destroys an opponent's monster by battle and sends it to the GY: Inflict 1500 damage to your opponent.
Rulings
- When Inferno battles with another monster with equal ATK, Inferno's effect is not activated because it must destroy the other monster and send it to the GY, and at that time, Inferno is no longer on the field to activate its effect.
- If Inferno attacks a face-down Cyber Jar, Inferno is destroyed by the effect of Cyber Jar and Inferno's effect is not activated.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Goat forum — sourced change requests get reviewed.