With Mal'Ganis out, your Life Taps are free, which is pretty neat. Too bad it costs 9 though...it might see play, but 9 is a lot of mana and it's competing with Jaraxxus and Ysera.
Vol'jin looks pretty cool.
0 mana 0/2 TAUNT mech. seriously. This could be nuts
Seriously?
Yeah, I'm curious what you mean too. I can see this being situationally not terrible (play some good card, play free taunt card to protect it), but I do not see this card as nuts and will only be good if you can combo it with other mech cards to leverage extra stats or cards out of it. It has terrible stats, and Goldshire Footmen, Shieldbearer and Voidwalker are cheap taunters that already exist and are never used in Constructed (Goldshire, Shieldbearer) or only situationally (Voidwalker) and every single one of those cards has way better stats than the Target Dummy. Does the fact that it costs 0 and is a mech make it better?
This cards main impact seems to be that it lowers the average quality of Mech cards that can randomly be dropped.
Just being a 0 cost Mech is good enough for an aggressive Mech deck. I haven't looked at it too carefully, but there are a lot of good 2/3 cost mechs that buff other mechs, and any attack buff on the 0/2 Taunt suddenly makes it less harmless. Consider turn 1 0/2 taunt, Cogmaster, which you can do as first player. Shieldbearer has been used in Zoo decks before to protect minions for an extra turn, having Mech bonus on top of it could lead to nutty scenarios.
Affinity from MtG has a similar thing with Ornithopter - by itself it's bad, but with all the artifact cards and Cranial Plating, it gives you lots of consistency and speed.