Favorite HERO Shining Flare Wingman

1 Fusion Monster + 1 face-up monster on the field
(This card is always treated as an "Elemental HERO" card.)
If this card is Special Summoned from the Extra Deck: You can shuffle 5 monsters from your GY into the Deck, then draw 2 cards, and if you do, this card gains 1000 ATK. You can only use this effect of "Favorite HERO Shining Flare Wingman" once per turn. If this card destroys a monster by battle: Inflict damage to your opponent equal to that monster's original ATK.