Cards and Castles Ultimate asks you to play the unit after playing the card

In Cards and Castles Ultimate, playing a unit card is not described as the end of your involvement with it. The official App Store listing says cards create fully controllable units on the battlefield, alongside spells and other effects. The deck provides the piece; the board gives you something further to do with it.

That distinction changes what a card choice is preparing. You are choosing an available unit, but also preparing for decisions about its use once it exists on the field. The description does not establish movement distances or turn costs, so it cannot support a worked tactical sequence.

The attraction is the handoff between collection and control. If you enjoy choosing tools before a match but also want to direct the pieces those tools create, this is a concrete reason to examine Cards and Castles. A strong deck and a well-used unit are related interests, rather than interchangeable achievements.