Are mind games useful for a healthy relationship ? 
Mind games are the deliberate actions of calculated psychological manipulation intended to intimidate or confuse (usually for competitive advantage). Mind games are considered to be the white lies in a relationship. Just like every coin has two sides mind games has a +ve and a -ve side to it. These intellectual tricks could be used to start a new relation, survive and develop in a relationship, dominate in the relationship, mess up the mind of the other person in a relationship etc. In a relationship a mind gamer has the ability to make the other person totally vulnerbale to him. Relationships can wilt and fortify because of the mind skills.
Mind games is generally considered to be a bad term for the relationships but its NOT. Going forward I would not use the word "mindgame" , instead I would use mind skills. Mind skills gives a sense of positivity and appreciation. You can use the mind skills in a positive manner by understanding the needs of the other person in the relationship. By this you are accommodating the other person's feelings and sowing the seeds of strength in the relationship.