I voted for Shard of Sacrifice, Graboid, and Discord. (I haven't tried or seen Shard of Focus in action to judge it), Shard of Sacrifice can be very OP in certain situations, but if you run a good OTK deck, that doesn't matter. I only voted for that because you can fully recover the 40 HP and then some in most situations. Graboid, I have made this argument before, and so has everyone else, so I won't say anything. Discord, I just think it costs too little for such a devastating effect.