Koa'ki Meiru Sandman:

     So there are enough Koa'ki Meiru, Rock-type monsters now to kind of try and make a deck around them... and this guy, of course, is one of the reasons.  Boulder is the searcher, while Guardian, Sandman, and Prototype are the muscle and negation.  Throw in a couple of Thunder Kings and you've got the start of a fun, casual, deck.  But I digress, this card itself is decent, protecting investments already on the field from traps.  If he's the only card on your side of the field, his effect could prove to be moot though... although I would gladly sacrifice him to stop something like Trap Dustshoot.  I'm not very familiar with Koa'ki Meirus so I don't have much to say, and if I keep going I'll most likely start talking about how I ha....... never-mind.

Traditional:  1.5
Advanced:   2.0  (that whole being an Iron Core monster thing...)

Wednesday-
 
The Sandman is a very interesting card. It'll likely anchor the Rock Stun archetype (that already has Guardian and a few nifty win conditions). The card is solidly designed and fits in to the whole Koa'ki Meiru theme of negation or prevention effects.
 
Rock Stun is actually a decent deck for a local tournament. I would imagine it is only a few support cards away from nearing tier two status levels (able to top a regional). It needs more glue cards like Sandman.
 
T: 5/5
A: 5/5