First, it reduces the cost of your Black spells - a welcome cost cutter for decks that run high cost Black finishers like Torment of Hailfire, or Gray Merchant of Asphodel
This Changes Everything is an ability that allows players to deal three damage to another damaged character whenever Helga Sinclair, Femme Fatale, quests for lore
It also makes an even 16 basics total, one for each numbered game in the franchise
That does some wild stufffor example, it gets Marsh Flats back twice for actual land ramp in Orzhov, it lets you feed cards like Dusk Legion Zealot into a Warren Soultrader multiple times, or it wrings the most value possible from cards like Boromir, Warden of the Tower and Dauthi Voidwalker
These cards represent characters that FF players and collectors are familiar with and have attachments to, so the art is probably more meaningful and relatable to some people than, say, an art series version of some random legend from Ixalan
Players can only respond once this spell has been cast and all its costs have been paid