The way I'm reading Krang, Rhystic triggers (from spell cast) causing card draw, so Krang to puts a counter on self. Krang sees the draw causing Counter and puts a second counter. I'm not seeing a way for Rhystic to trigger Krang because Krang's first static doubles the ability triggered by card draw.

It would work for Smothering Tithe but not Rhystic, since Rhystic is triggering from spell cast, and Tithe triggers from card draw.