This card can banish a card from your opponent's Graveyard.
You have to banish a FIRE monster from your Graveyard to activate its effect.
You can chain Sealing Ceremony of Katon to your opponent's card effect that has something to do with his/her Graveyard. E.g. When Sacred Phoenix of Nephthys is being special summoned from the Graveyard at your opponent's Standby Phase. Use this cards' effect prevent the summoning by banishing it.