One example of this is the PSA 10 Base Set Holo Shadowless Charizard, which fetched over $400,000
Most Japanese base set cards will contain a rarity symbol in the lower-right corner of the card that varies based on the card type
MTG Hivemind learned how to create unique cards using keywords, and also how to generate interesting information to fill keyword fields this is explained under the Assembler section
That said, there are plenty of other valid options as well, such as Discord, which I'll get to in a little bit
You can pat yourself on the back for clever use of the legend rule to be your sacrifice outlet, and yes you come out with a measly one treasure per transaction, a lot of other triggers happened along the way, when a creature dies, when an artifact comes into play or is sacrificed, those payoffs can win you the game
the very rare cards) Finally, individual cards are assigned to the different rarities