Incrementor

The Shadow Enemy Card, which activates Incrementor

Incrementor (ナンバープラス, Nanbā Purasu, lit. "Number Plus") is an ability that appears in Kingdom Hearts: Chain of Memories and its remake, which increases the value of all cards by one. This ability comes from the Shadow Heartless's Enemy Card. Only Sora, Riku, and the Riku Replica have access to the Shadow Enemy Card, thus the only ones who can use the Incrementor ability.