You might also, though this is more of a problem for having inked "cartomancy", use a more accurate terminology. -mancy and -mancer are, properly, specific to divination, not to magic generally. C(h)artomagy, c(h)artomagic, c(h)artogoeteia, or c(h)artogoetics (I especially like the last for a more Renaissance-level, dawning-science magical environment) would all be more appropriate names for what is described.

I really like the idea, though. It's a stepped-up version of sympathetic magic like the familiar "voodoo doll", so it has traditional resonance, while opening up a lot of new narrative opportunities.