The card combination ability in Kingdom Hearts: Chain of Memories is called a Sleight.
In Chain of Memories, Sora does not fight with a conventional command menu. Instead, attacks, magic, items, and enemy cards are represented by cards in a deck. Players can play cards individually or combine several cards into a Sleight, producing a stronger attack or a special effect.
Sleights add a strategic layer to the game's card system. Combining cards usually requires their total value to meet a specific condition, and the first card used may become unavailable for the rest of the battle. This means powerful combinations can be useful, but careless use may leave Sora with fewer options later.
The term is easy to confuse with “Command,” because commands are a broader part of Kingdom Hearts combat terminology, or with “Attack” and “Magic,” which describe card categories. In Chain of Memories, however, the named ability for combining cards is specifically a Sleight. The system also appears in the remake Kingdom Hearts Re:Chain of Memories.