I have noticed that there are a number of cards that have the following text (or a variation of it):
Inflict [some amount of] damage to your opponent's Life Points.
Cards that follow this format are:
- Sparks: 200 points
- Raimei: 300 points
- Hinotama: 500 points*
- Final Flame: 600 points
- Ookazi: 800 points
But why would you ever want to choose Sparks or Raimei when Ookazi does the exact same thing, but deals more damage?
This doesn't seem to be a matter of power creep; these cards all seem to have come out at about the same time: 1999 for the Japanese versions, 2002 for the North American versions, and 2004 for the worldwide versions. So all of these cards were available at about the same time, (and Ookazi was in the Kaiba starter deck, so it wasn't hard to find).
When a spell card exists that says "Inflict 800 damage to your opponent's Life Points", why would you ever want to include a card in your deck that says "Inflict 200 damage to your opponent's Life Points"?
* There is also Goblin Thief that deals 500 points of damage to your opponent and you gain 500 points. I understand why someone might want to choose Goblin Thief over Ookazi, but not why someone would want to choose Hinotama over Goblin Thief.