2 Level 4 “Fire King” monsters
This card cannot be destroyed by the effect of “Fire King” monsters. If a face-up “Fire King” monster you control is destroyed by a card effect (except during the Damage Step): You can Special Summon this card from your Extra Deck. After this card was Special Summoned this way, you cannot Special Summon monsters for the rest of this turn, except “Fire King” monsters. When this card is Special Summoned, you can destroy 1 “Fire King” monster in your hand or that you control, and if you do destroy 1 card your opponent controls. If a monster(s) would be destroyed by the effect of a "Fire King" monster, you can attach that monster(s) to this card as an Xyz Material instead of sending it to the Graveyard. If this face-up card would be destroyed or banished, you can detach 1 Xyz Material from this card instead. You can detach 2 Xyz Material from this card, target 1 “Fire King” monster in your Graveyard, Special Summon that target but it is destroyed during the End Phase. You can only use this effect of “Fire King High Avatar Hiro” once per turn.