Fire King High Avatar Garunix Level 8 FIRE Winged Beast Once per turn, during the next Standby Phase after this card was destroyed by card effect and sent to the GY: Special Summon this card from the GY. If you do: Destroy all other monsters on the field. When this card is destroyed by battle and sent to the GY: You can Special Summon 1 "Fire King" monster from your Deck, except "Fire King High Avatar Garunix". ATK 2700 | DEF 1700 |
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Before Fire King Courtier Ulcanix, this card was somewhat useful in case you needed Sacred Fire King Garunix to gain a significant ATK boost, maybe to beat a large monster.
The field clear was still useful too, but you'd more often reach for Garunix Eternity, Hyang of the Fire Kings before you'd reach for this card, thus most people would run 1 copy, or even 0.
With Ulcanix, he's now a necessary piece for her combo line as she Special Summons him from deck if Ulcanix is destroyed by card effect. Thus, running 1 copy is pretty much mandatory.
However, you mostly want him to sit quietly in the deck until he's needed, so going over 1 copy isn't recommended.
The second effect rarely comes up, if ever. Smart opponents will try to avoid battling it, and you'll end up using this card as Xyz or Link material long before it would have a chance to be destroyed by an opposing monster.