the change of heart card represents polarization and the anima

bakura is symbolic of lucifer

yugioh paints the masculine energy as the enemy, so bakura has the upright triangle worn around his neck

yugi, the person they want you to see as the hero, wears the inverted triangle, which means hes aligned with the feminine energy or darkness. the hero figure is the balancer, the antichrist (false messiah of the jews) reincarnation of king solomon, etc

yugioh is an anime about good lucifer (yugi) defeating bad lucifer (bakura). all of it is "self". selfishness is demonic