Elemental HERO Darkbright (SGX1-ENA25) [Speed Duel GX: Duel Academy Box]

"Elemental HERO Sparkman" + "Elemental HERO Necroshade"
<br>Must be Fusion-Summoned. If this card attacks a Defense Position monster, inflict piercing battle damage. If this card attacks, change it to Defense Position at the end of the Damage Step. If this card is destroyed: Target 1 monster your opponent controls; destroy that target.