So with no extra actions this is basically Remodel BUT if you forgo the gaining from turn to turn then it can become a Super-Remodel. In an engine with plenty of actions you could stack four of these to turn a Copper into a Province. Also, KC-Butcher turns an Estate into a Province just by itself.
It will be interesting to see how other cards from the set which also give out physical coins will interact with this. There must surely be more than one coin-giver in the set (I'm guessing 3, since there are 3 VP chip cards in Prosperity, 3 Looters in Dark Ages) so it's reasonable to assume that you can earn them with 1 card and use them with another.
Actually, the more I look at this concept for this card, the more appealing the whole mechanic is becoming to me.