In magic marketing we hear the title "Holy Grail" thrown around a lot. The "Holy Grail" of chop cups, the "Holy Grail" of coins across, the "Holy Grail" of all card tricks. When we think of this we usually think of any card at any number: "The spectator shuffles and examines a deck of cards. They then place it on the table any spectator calls out a card and another calls out a number. A fourth then takes the deck and deals down to the number named and it happens to match the selected card. The deck is then examinable." What are some other descriptions of "Holy Grails"? Do you know any current effects on the market that fit you description of a "Holy Grail"?