Fire King Sky Burn Quick-Play Spell Target an equal number of "Fire King" monsters you control and cards your opponent controls; destroy them. If a "Fire King" card(s) you control would be destroyed by card effect, you can banish this card from your GY instead. You can only use 1 "Fire King Sky Burn" effect per turn, and only once that turn. |
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This is just really good removal - since most of our cards do something when they are destroyed, (or in the case of Sacred Fire King Garunix, any FIRE monster), you will usually end up better off using it.
Of course, you still need to make sure you destroy the right monsters, and remember that you need to target Fire King monsters with this card, so you can't pop Amphibious Swarmship Amblowhale or Duelittle Chimera with this.
The GY effect is also really useful and can save you in a pinch - just make sure you don't forget about it as you keep adding cards to the GY.
Anything between 0-2 copies is fine. Remember you can search it off Legendary Fire King Ponix, so you can probably do well with just one copy. Experiment and find what's best for you.