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That card was Sphinxs Revelation, which went on to largely define Standard for two years, as well as dominate Block Constructed for Return to Ravnica

X Ball deals 20 damage times the number of Energy cards attached, though the drawback is that it also hurts Mewtwo alongside the defending Pokmon

This means that the battle card type wont show up in all (or even most) sets, but its a tool that can be used by the games designers if it fits a sets flavor or mechanics

Pros and Cons The best perk is that this is absolutely free and all you have to do is play

Another strategy against Mew ex is feeding it a tanky card with minimum damage

Counterfeiters heavily target them with proxies that look severely darkened or artificially washed out, paired with poorly resolved, blurred text that gives away their low-resolution scan origins