A 0/1 flier you get to keep regenerating for a single black means youre pretty safe against a wide variety of decks that may want to chip in damage or have to connect damage in order to get their benefits from damage triggers
A PSA 10 copy famously sold for US$5.275 million in 2022, setting a world record for the most expensive Pokmon card ever sold
One extra turn buys you plenty of advantages
You generally want to block with exactly enough if a creature has more power than toughness, one extra if the creature has equal power and toughness, and several extras if a creature has less power than toughness, but those guidelines are very flexible
While you may have been drilling a Mewtwo ex build since Pokmon TCG Pocket came out in October, you may be sick of it at this point, its hard to deny how powerful it is
If youre in an Oswald Fiddlebender deck then you tutor up something like Staff of Domination or Voltaic Construct and the mana flows and flows