Arcana Knight Joker (STP3-EN023) - Speed Duel: Tournament Pack 3 Unlimited

"Queen's Knight" + "Jack's Knight" + "King's Knight"
A Fusion Summon of this card can only be done with the above materials. Once per turn, when a Spell/Trap Card, or monster effect, is activated that targets this face-up card on the field (Quick Effect): You can discard the same type of card (Monster, Spell, or Trap); negate the effect.