These cards were only issued to certain participating stores and intended to serve as mechanisms to promote the then-upcoming international debut of the Pokmon TCG
Yes, if youre running a deck that uses the graveyard or you dont want to pay the Commander Tax, you can pop the creature into the graveyard until youre ready to exhume it
Attack with Ukkima, get its leave the battlefield ability when you ninjutsu in your real attacker, buff the Ninja with Cazur, rinse, and repeat
It is a card that captures Mewtwo's emotional core, that sense of being immensely powerful yet profoundly alone, in a way that few other card illustrations have managed to achieve across the entire history of the TCG
Rakdos colors are hardly lacking in ways to inflict self-burn, and will happily pay the risky price to play spells for so much cheaper