Elemental Hero Thunder Giant (DP1-EN011) - Duelist Pack 1: Jaden Yuki Unlimited

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.