Strategy:Helping Other Players Complete Their Full Sets is Good karma
Since a Deal Breaker can only be used to steal full sets sometimes it’s good strategy to “help” your opponent complete a full set.
Strategy Examples:One way to “help” your opponent is to entice them into completing that set. For example, if your opponent has two dark green property cards on the table (none are dual color wild property cards) and you have one in your hand (as well as a Deal Breaker), laying it down may be enough to entice them to steal it to complete their own full green set, you can then use your Deal Breaker on your next turn to steal that full set.
A similar approach is to pay them into a complete set. For example lay the green property on the table, wait for your opponent to charge you (or the table) Rent and then pay them with the green property, essentially forcing them to complete the set even though they may not be ready to defend it.
Lastly force a complete set onto your opponent by using a Force Deal action card. For example, lay down your green property card, use a Force Deal to swap it with some other (non-green property) card of theirs. This gives them a full set of green which for your third turn you can use your Deal Breaker to steal. In one turn you gained both a full set and a extra bonus property card.