Well, it finally happened. In a recent tournament, I'm merrily crushing a control player into the ground with a combination of land destruction and a Sengir Vampire, when he uses evil artifact mana to cast Panoptic Mirror imprinted w/ Time Walk. In case you aren't familiar with this POS, PM allows you to cast the spell imprinted upon it WITHOUT PAYING ITS MANA COST. So even though this clown had no blue mana available, he could take turn after turn for free, while I never got a turn for the rest of the "game". I use quotation marks because this had ceased to be a contest, and suddenly become a one-sided exhibition match. Isochron Sceptre is bad enough, but I feel the restrictions on the nature and casting cost of the imprinted spell keep it from being too broken, although when imprinted w/ Counterspell or Boomerang, this definitely falls into the category of very annoying. I think Panoptic Mirror should be banned in type I to prevent this type of abuse.