Interesting way of giving pillars protection (:
Great minds think alike
Marks aren't usually accesible to players normally as cards, so not only does this give you an indirect access to these cards, it also allows you to split up your stacks. It also helps whenever you're low on light and need fire quanta and vice-versa.
im not sure. this ability is very powerful, i mean seriously, a MARK OF FIRE OR LIGHT! i dont think elements is ready for bi-colored costs just yet
You do realize that a mark is pretty much the same as a pillar, right?
^This. It's basically soft PC as well as a way to manipulate your own permanents, especially quanta-producing ones (for now, only pillars).
Also, no offense meant, but bi-colored/dual quanta costs are the point of this series. Duality is built around synchronizing two elements.