Its definitely worth adding a card to your inkwell for the first five turns, but you dont have to keep doing that forever
The payoff is more consistent access to the aforementioned Scion of Darkness, and that seems like a sweet package to me
It is also possible to win by forcing our opponents to mill their entire decks with Altar of Dementia, and forcing them to deck out
Creatures (26) 2 Verdurous Gearhulk 4 Voltaic Brawler 4 Lathnu Hellion 4 Bristling Hydra 4 Electrostatic Pummeler 4 Servant of the Conduit 4 Sage of Shaila's Claim Lands (20) Spells (14) Voltaic Brawler and Lathnu Hellion are great cards and great sources of Energy
They are classified as rare, so it is extra special to find one in your booster pack, and they always have art that is themed to the set
This all culminates in an ending where Yuna's whistling to try and desperately reach out to a Tidus who's not there, which in turn results in a post-credits scene where, well, play the game for yourself