This is my idea of a great mask of binding - the power, as I imagine it, would allow the user to bind any two objects they recently touched - when the bind is activated, the two objects would be pulled towards one another. Or, in the case of one object being significantly heavier than the other, the lighter object would be pulled towards the heavier one. The two objects would then remain attached until the bind is released.

Note: the images of physical prints shown are masks I printed on my resin printer at home and sold on my etsy shop in the past. They're just meant to show examples of physical prints. I tried to include some on mocs, so you can get a sense of how it would look on a build.