Strategy 1) Mindgate - the clearest synergy. If you get nonpillar cards before you get pillar cards, Mirror Pendula can generate the quantum needed to copy the opponent's strategy quicker, at the cost of a slower start up.
Strategy 2) Predicting the opponent - certain tournaments and PvP events confine players to certain marks or may encourage players to use certain elements over another. This sets up for trying to predict what deck your opponent will run so you can run a counterdeck that is mainly of the element of his or her mark.
Strategy 3) More of a hypothetical strategy, but if there was ever a card that could temporarily alter a target mark this could be used in conjuncting w/Mirror Pendulum to generate quantum of a desired element.