Electromagnet play

So is type of H-bridge?

What is the maximum number of 12V electromagnets do you reckon I can run off this shield? I was hoping for at least 3-4....but I see it says you can control two DC motors with this....is that the same for electromagnets?

Also I was hoping to run an RGB LED strip off the same microcontroller. I've been told it uses two SPI pins and two Power pins. Is this possible? I've attached the pins list - maybe someone can help me figure out if there is enough space for these?