Tweak the Pillar of the Paruns format

[Susucre]

Tweaking the custom Pillar of the Paruns format.

After testing a few times, the following was modified:
-> I wanted to add a couple ability to Pillar of the Paruns. This was done here adding a custom version of the card, in an "Custom Alchemy" set. It is more straightforward than adding continuous effect to games in the custom game mode.
-> Starting life set to 25. Ideally this would be a custom option instead in the future, but I delayed working on that due to waiting a PR to be merged first.

[xenohedron]

It's slightly confusing to add a custom set in this list. But if that's the only way for it to work, it's okay.

[Susucre]

Yeah that first add is for "attempt to download through scryfall", then the directDownloadLinks will direct url download the pillar image from dissension to the correct folder for CALC/1

I did not want to do an heavier rework of the logic, but still have some image on the custom card.

[xenohedron]

I'm okay with these workarounds- will give it a few days before merge in case anyone else has ideas for how to structure this more cleanly.

(I do eventually want to move custom cards into a different part of the file structure but since I don't have a proposal ready, not going to gate this, it'll be simple enough to move in the future.)

[Susucre]

And the main reason for the custom card and not adding more to the custom mode:
In long term, I'd like to phase out the custom mode entirely.

• 6 starting hand and 25 life would be custom options available to any match/tournament.
• The "skip first land drop" and "conjure a C-Pillar of the Paruns" would be on a custom Emblem each player would start with. But this needs for new feature: Emblem Cards #10498 to be there first.