Like most Pokmon cards, the value of Mewtwo-EX depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (BREAKthrough)
Originally given as a reward for those who had a winning entry in the Japanese Pokemon Card Game Illustration Contest that started in 1997, one copy is known to be held by the Official Pokemon TCG Blog, meaning only five are actually doing the rounds out there
That sort of thing is good
There are two objectives when playing Exodia: stalling your opponent and fetching cards
Lets hope that future sets dont have names that are longer than The Lord of the Rings: Tales of Middle Earth because things could start to get hairy
Players take turns battling with Pokmon, using attacks, Trainer cards, and Energy cards strategically to knock out opposing Pokmon