Road Magic – Explosion
Normal Spell Card
Requirement: You can activate this if you control a face-up monster (Level 7 or higher/Spellcaster-Type) by sending 1 monster (FIRE-Attribute) from your hand to the Graveyard.
Effect: Inflict 400 damage to your opponent for each card they control.

This is a Promo for Rush Duels from Saikyo Jump, the kid’s magazine targeted at the SEVENS age group.

Source: Weekly Shonen Jump