Hikari's cards.

What looks like a normal deck of cards, is actually a full arsenal of weapons.
Each card can summon a specific weapon(s), and can be combined with another card to have an added feature to it.
For example, A card to summon a basic kunai can be summoned along with a poison card, to summon a poisoned kunai.

Weapons that can be summoned:
-Kunai
-Shuriken
-Senbon
-Basic Katana
-Makibishi spikes
-Nunchuks
-Scythe

Abilities that can be added:
-Magnetism (attracts other metal items to it)
-Electricity (gives opponent a shock, mild to severe)
-Fire (makes the weapon burst into flame)
-Poison (basic poison, infects the opponent)
-Paralysis poison (renders the opponent unable to move for several minutes)
-Sleeping poison (knocks the opponent unconscious. Time depends in the strength of the opponent)
-Numbing poison (body part hit will become numb for several minutes)
-Darkness (makes the weapon sharper, faster, and deadly)