Keep attacking to reduce the opposing Leader cards Life to 0 and deliver a finishing blow to achieve victory
Not to mention, if you're looking at an older core set card from before Sixth Edition , there may not even be an expansion symbol at all
Like most Pokmon cards, the value of M 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)
Eloise, Nephalia Sleuth is a flavorful and mechanically interesting option for an alternative commander, while cards like Empty the Laboratory capture the polymorph dream, and Shadow Kin is just cool
If you have a lot of 4+ player Commander games, Coastal Breachs always on cost reduction is going to be pretty attractive, as it requires no setup at all
But Sefris of the Hidden Ways is an exception