Tengu format ruling
Arcana Knight Joker
Card effect (current official text)"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.
Rulings
(C) A Fusion Summon of this card can only be conducted with the above Fusion Material Monsters. (1) Once per turn, if this face-up card on the field is targeted by a Spell Card, Trap Card, or Effect Monster's effect, you can negate that effect by discarding the same kind of card (Spell, Trap, or Monster Card).
- The (C) Condition cannot be negated.
- Elemental Hero Prisma (that has gained the name of one of this card's Fusion Material) can be used in this card's Fusion Summon.
- This card can be Special Summoned from the Extra Deck by Summoner of Illusions.
- The (1) Quick Effect is optional, it activates & resolves on the field.
- This effect must be chained directly to the card or effect that is targeting "Arcana Knight Joker".
- Discarding a card is a cost. This effect can be activated while Macro Cosmos is active.
- You can activate this effect during the Damage Step.
- This effect can't negate the effects of "Call of the Haunted" that destroys "Arcana Knight Joker" when it is destroyed.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.