Take a new foil method, give it to one of Magics most popular characters, and put it on one of her better cards, and the result is a piece worth over $200
The ability to interact while technically having no mana available changes how opponents sequence their plays
It just allows for an alternate cost to be paid
OK sure, full on card draw would be better and the mana restriction is significant, but if you airbend at all, a of this artifact is perfect to replay those cards
Chart shows the price of Madam Mim - Up to No Good [Foil] #59 at the end of each month going back as long as we have tracked the item.
If you cast Display of Power, you can, at most, make one copy of each instant and sorcery spell on the stack