Magic is all about the little edges, and getting to spend a single extra mana each turn compared to your opponent adds up quickly in fair decks, and the extra mana allows unfair decks to win with blinding speed
Then you can tap her with a green mana to make mana equal to your highest power, and with an X spell Hydra like an 7/7 you have already you now convert one to 7, and drop an 13 with that mana for the next one, draw and then have 13 even more and can win fast with their size or make enough mana to win with stuff like Staff of Possession, Fireball and other stuff
I didnt find out how the MPC-Autofill contributors were making their cards
The last mini-expansion in the game included 68 new cards for players to collect, including secret rares and unique art variants
While the set is predominantly focused on Mega Zygarde, there are several other characters and Pokemon who make a claim to be the most valuable chase card in Nihil Zero