Cobalt Guardian is bad. Are you guys serious? How long does Knife Juggler live? or the Shaman overload creature, etc? (oh and don't even start on about how "those cards are still played... because that's totally irrelevant, they are ~<3 mana, it's fine if you don't get their bonus or it only goes off once... the same isn't true for a 5 drop). You seriously think you can set up a line of taunts just to benefit from a few divine shield tokens that are only crated upon summoning a mech? And then utilizing those DS "tokens" beneficially with a 5/3? Not going to happen. It's going to die to 2 drops/2 mana cost cards and you are going to weep. Bad. Highly situational, very low and tiny potential. Only good card in past few days is the Druid one, and they don't even really have room for a 2 drop, unless the rest of the unreleased cards warp the meta so hard the Druid does a 180.