Retrograde (ナンバーリバース, Nanbā Ribāsu?, lit. "Number Reverse") is an ability that appears in Kingdom Hearts Chain of Memories. It reverses the values of all cards, changing 1 to 9, 2 to 8, and so forth. Cards with a value of 0 are not affected.
Retrograde is an enemy card effect that costs 30 CP to add to the deck and lasts for one reload.
Kingdom Hearts Chain of Memories