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Because the SR pool includes both standard full arts and the 2 SAs, each box has roughly 20% odds of the SR slot being an SA giving you ~1 in 5 chance of walking away with a Mewtwo V SA or Conkeldurr V SA from a single box
This card hasn't been reprinted in paper due to its position on the Reserved List, but this Arena version is free to use in the Timeless format, once you get your hands on a copy
This set was released in the spring of 2004 in Japan, and summer of 2004 in North America
Overall, Gardevoir ex strategies did not need a buff to succeed, but Jellicent ex is likely to make the deck even better than it ever has been
Pieces like Darksteel Plate and Commanders Plate are fantastic protection, and should keep Cloud alive in a lot of cases