Chaos Chaud wrote:It will depend. I think if they start doing the grail system from scratch, including they Great Holy Grail, it won't be contaminated. About the effect, it should differ according to how spiritually charged the land is. For an example, if the ritual was done in Aozaki's land(which is high spiritually charged) the ritual should be easier to perform and the effect should be more powerful.
And btw, Fuyuki Grail is a copy of the real Holy Grail. There is a real Golden Grail out there which can grant wish. That's why they make an "advertisement" of a wish granter to attract more Magi to participate.