Typically I drop a giant behind the king tower and I wait for my opponent to drop down his troops and when the giant is in the bridge, I have enough elixir to either lightning or drop support behind the giant. If he drops any of the two: ice wiz, mega minion, princess, musketeer, wizard then I use my lightning to clear them out with some tower damage. Incidentally, lightning is great vs 3 musketeers but most pros will split them behind the king tower but getting 2 musketeers and tower damage is good value for a 6 elixir lightning. Tombstone is a great defensive card than can become offensive if the giant can tank for it. It can stop the prince, mini pekka, hog, sparky and to some degree royal giants. It can also distract giants, golems and pekkas. Also I use it as a damage sponge in some desperate situations. You know that situation you described? 3M at the bridge? Ash (awesome youtuber) showed several counters to the 3M. There is one wherein he used the tombstone + ice spirit and cleared out the 3M! Pump is risky not because of the cost for me since I'm used to opening with a lava hound which is 7 elixir. The problem is how easy it is for your opponents to get value. Rocket will result in even elixir trade+ tower damage. Same with other spell options. I foresee an HP buff for the EC in the next update.