Few cards do precisely this while both delivering on the characters potential and telling a meaningful story
Disney has also pledged to produce expansion packs for Lorcana
Marcy: Fenrir (and a few other Norse figures, as you may have noticed) exist in FF often as Summons, Bosses, or Named Things
The most impactful card is probably Exterminio, which would translate literally to Extermination but probably references to Overkill, the mechanic from Final Fantasy X, . Exterminio is a black instant removal spell with an interesting twist: setting a creature's health to -9999 plays around indestructible
Emerald also had cards that give you information on the opponents hand, so if you find their hand lacking a high-cost Character, then you can slam The Return of Hercules
Though this may make Fabled seem a bit less exciting for pulls, it will allow for many fan-favorite cards to continue to be used as long as there is a reprint available in approved sets like Fabled