Here is a spirit/clone deck that I had built a pretty long time ago when Innistrad was the newest block. I have updated it with the new Ravnica block stuff. Basically, get the spirit captain out and copy it a bunch of times to make all your stuff hexproof and super giant. If you don't get the spirit captains you can always use the clones to copy and use your opponent's creatures against themselves. Cackling Counterpart serves double duty as stopping targeted removal when you can copy a spirit captain because it is instant speed!