Card states “Deal damage to a creature equal to it’s toughness” but I think it’s doing it equal to it’s Power. Either the text is wrong or the effect it wrong.
The text is probably wrong in terms of color balance. If the text was accurate, then red would have what would be a creature destruction spell for 6 mana. Which would be rather broken in terms of balance!
The magic card does damage equal to its power, so it’s likely a display error rather than a functionality one.