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Kiseitai
When your opponent's monster attacks this card in face-down Defense Position, this card becomes an Equip Spell Card equipped to the attacking monster (No damage calculation is conducted). During each of your opponent's Standby Phases, increase your Life Points by half of the ATK of the monster equipped with this card.

Kishido Spirit
Monsters on your side of the field cannot be destroyed in a battle if the monsters' ATK are equal.

Knight's Title
Tribute 1 face-up "Dark Magician"; Special Summon 1 "Dark Magician Knight" from your hand, Deck or Graveyard.

Koitsu
Once per turn, during your Main Phase, if you control this card on the field, you can equip it to your "Aitsu" as an Equip Spell Card, OR unequip the Union equipment and Special Summon this card in face-up Attack Position. While equipped to a monster by this card's effect, increase the ATK of the equipped monster by 3000 points. When it attacks with an ATK that is higher than the DEF of a Defense Position monster, inflict the difference as Battle Damage to your opponent's Life Points. (1 monster can only be equipped with 1 Union Monster at a time. If the equipped monster is destroyed as a result of battle, destroy this card instead.)

Kojikocy
A man-hunter with powerful arms that can crush boulders.

Kotodama
If there are face-up monsters with the same name on the field, destroy those monsters. (If a monster is Summoned or flipped face-up that has the same name as a monster that is already face-up on the field, the new face-up monster is destroyed. If they are Summoned or flipped face-up at the same time, they are all destroyed.)

Koumori Dragon
A vicious, fire-breathing dragon whose wicked flame corrupts the souls of its victims.

Kozaky
A workaholic fiend who devotes everything to his research into the languages of Dark World. His mind has collapsed because of working too hard.

Kozaky's Self-Destruct Button
Inflict 1000 damage to the player who destroyed this Set card.

Kryuel
When this card is sent to the Graveyard as a result of battle, toss a coin and call it. If you call it right, destroy 1 monster on your opponent's side of the field.