Elemental Hero Thunder Giant [TLM-EN036] Ultimate Rare

Elemental Hero Sparkman' + 'Elemental Hero Clayman' This monster cannot be Special Summoned except by Fusion Summon. Discard 1 card from your hand to select and destroy 1 face-up monster on the field with an original ATK that is less than the ATK of this card. You can only use this effect once per turn, during your Main Phase.