"Dragon Capture Jar" can be used to force all monsters on the field to be in Defense Position. This can be particularly useful in a Link-based Decks, as Link Monsters are completely immune to that card.
This card can be combined with "Galaxy Dragon", to increase its ATK by 1000 every time it battles an opponent's monster, and negate their effects during the Battle Phase.
This card can be combined with "King Dragun" to extend its protection to any monster its owner controls. This can also be effective against Decks revolving around Equip Cards or Union Monsters, as the opponent will be unable to target the intended monster(s).
"Lady of D." can be used to prevent the opponent from attacking any of its controller's monsters.