Gem-Knight Prismaura (HA06-EN020) - Hidden Arsenal 6: Omega Xyz Unlimited

1 "Gem-Knight" monster + 1 Thunder-Type monster
Must first be Fusion Summoned. Once per turn: You can send 1 "Gem-Knight" card from your hand to the Graveyard to target 1 face-up card on the field; destroy that target.