The Capture Card is a very special card introduced in Lost Kingdoms II.
It does not summon a Monster and it is not bought in the usual shops. It is a replacement for the Capturing mechanic in the original game. Similar to Lost Kingdoms, throwing a Capture Card will generally do very minimal damage. But if the damage would normally kill the target, the Capture Card will transform the monster into a Card.
The new Card can be collected from any Deck Point or at the end of the current level. Quitting will also give the player immediate access to the new monster.