Zanz already talked about this in chat. He was considering making it a rare that would flip between giving 3 random quanta and 2 quanta of your mark. This wasn't implemented, but perhaps we may see it in the future.
2 of your mark every second turn? That sounds a bit overpowered, as its quantum production would basically be that of a normal tower with the extra ability of 3 random quanta every second turn. Wouldn't the hypothetical rainbow pendulum make more sense with 3 random and only 1 of your own?