Reload Card
The Reload Card is the card used by Sora, Riku, and all non-heartless bosses in Kingdom Hearts: Chain of Memories and Kingdom Hearts Re:Chain of Memories. It is a black colored card with no picture, but instead a large number in the middle of it.
This card reloads all re-loadable cards in their deck. Each time it is used, it takes a longer amount of time for the cards to be reloaded.
The large number on the card shows how long it needs to charge, with 1 being one second, 2 being two seconds, and 3 being three seconds. The maximum number is 3. The reload time can be reset with an Elixir or certain Enemy Cards.
The Reload Card Riku uses has no number, and a simple push of the button will reload his cards instantly. The reason why Sora's Reload Card takes time and Riku's doesn't is currently a mystery.