Battle Card

Battle Card was a planned item coming from KINGDOM HEARTS: Chain of Memories to be included in Super Smash Flash 2. The third iteration of the Smash Flash DOJO!!! had stated on April 14, 2012 that Battle Cards would no longer be a part of SSF2.

Overview
As described on their original DOJO!!! post, Battle Cards would have summon a random non-playable character to aid the player who summoned them in a similar fashion to released Assist Trophy characters, with the only difference being that only a  character (or, in a sense, a Disney character) would have appeared. Battle Cards would have come in red, blue, green, and black colors. The DOJO!!! post also implied Battle Cards would have caused other multiple effects on the summoner, as that is how the actually worked in their source game, however, developers would later clarified all Battle Cards were only meant to summon a character and that the color of the card would have nothing to do with its effect.

Origin
Cards first appeared in the game KINGDOM HEARTS: Chain of Memories where they were used by Sora and Riku to fight and proceed through Castle Oblivion. There are two types of Cards: Battle Cards and Map Cards. Battle Cards, in turn, are divided in Attack Cards, which contain one strike with a Keyblade (they are colored red); Magic Cards, which let Sora use a spell or use a summon (They are colored blue); Item Cards, which restore attack and magic cards after use (they are colored green); Friend Cards, which summon one of Sora's party members once retrieved and used (most likely the color of card that will summon characters in SSF2, they are colored green too); and Enemy Cards (enable a status effect, which can change Card Value, increase speed, and make Sora invulnerable to certain elements. They are colored black). There are other types of Cards but are not in the Battle Cards line.

Trivia

 * A rumor among the McLeodGaming community was that a card summoning item would appear in SSF2. This led to the belief that the items were Yu-Gi-Oh! cards, spreading discussion all over the forums. Nothing was official until the confirmation of Battle Cards, though.
 * Even though the Battle Cards are no longer a part of SSF2, it is still possible that the characters that were planned for use of the Battle Cards could still be used as Assist Trophies.