The Pokemon Trading Card Games third-ever set, Fossil, released on October 10, 1999 and served as the debut for a variety of popular mons, including Gengar, Dragonite and, of course, the eponymous fossil Pokemon that gave the set its name
While the "ease of flipping" category is, in large part, a product of the number of defense counters on the battle (battles range from three to seven defense counters, and a battle with three defense counters will be much easier to flip than one with seven), it also takes other factors into consideration, like whether the battle makes creatures (if so, we can use them to help defeat the battle, making it easier to flip) or whether the battle acts as removal (which can get a blocker out of the way, making it easier to attack and defeat the battle)
And while he is on the field, he can quest for two lore, which is not too shabby
(6/15/2010) If you cast a card from exile this way, it will go to your graveyard when it resolves, fails to resolve, or is countered
Feed your Inner Eldrazi Beast
Stock Up is Good