Don't think you could accomplish it with card dance, but you should be able to accomplish that with Shatter, using a gradient layer to control the AE's shatter. You could even make a custom shatter map to absolutely control how the transformer breaks up. Then you would just have to precomp your shatter animation and time remap it backwards.
Here's a pretty good tutorial on the basics of shatter.
Also Element from video copilot looks like it could be up to the task also. But it requires a little more prep work in a 3D program, check out this tutorial at 20:00.
Johnny Cuevas, Editor
"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.