It seems annoying to make explicit counters. It's much nicer when countering is an emergent property. I like the idea of selecting a card which will always be drawn in the first hand, this could even be restricted to pillars to aid trio decks which would greatly appreciate being able to have one pillar guaranteed for their minority element
Another idea on how to enhance possibilities without creating "welp, they decided to explicitly 'soft counter' the core of my deck" situations: allow allocating a small amount of initial quanta. Let's say three. That'd allow an unupped deck to not have to have air pillars if they want to sprinkle air weapon into their deck (they'd start with some) or an upped entropy deck to have a few lycanthropes
I also like the idea of being able to make your mark into a pendulum mark
It seems this change could be used to bring enhancement to the game to open up non mono play besides rainbow decks which are another thing altogether since they're based off of tripling one's overall quanta
As the game develops, the weaknesses of elements recesses and only makes a mono deck more powerful. There are twelve elements, any change should hope to foster one not restricting themselves to 8.3% of them (Which I suppose my idea of initial quanta sort of supports only having one type of pillar, so it's arguably misguided)