Talk:Swordsman/@comment-187.190.73.8-20170609150718/@comment-28089742-20170609152517

They are the specific CD up cards for specific series.

In this case, Swordsman is for Liu Bei and Hideyoshi to level up CD without the need of using Harpy BEFORE evolve.

This is what people usually do :

Got Hideyoshi -> Use 5 baby harpy, CD level 7, use 5 of these cards to increase CD level and at most lucky jump 3 CD (potential to instantly reach CD 10 -> evolve your card and use only 2 Harpy! (But Hideyoshi after evolve need 5 Harpy)

It's all the same towards other cards. Just take note which is for which series. You can browse the required cards in-game through the "?" sign at the top right of each card.