The cards are designed with their mechanics first in a spreadsheet, with rarity assigned according to certain stats and text
Whats worse is that Sin cannot be permanently killed, as a summoner needs to sacrifice themselves to create the Final Aeon, a being that can temporarily slay Sin for a few years, before it returns once more
Staff of the Storyteller as Yuna's staff from Final Fantasy X
Every time you gain life Excalibur II gets a counter, which increases the stat buff it offers when equipped
Kuja, Genome Sorcerer Rarity: Rare Card Type: Legendary Creature Human Mutant Wizard | Legendary Creature Avatar Wizard Power/Toughness: 3/4 | 4/6 Casting Cost: 2BR Market Value: $1.02 (Regular), $1.57 (Foil) A lot of attention has been paid to Vivi as the ideal Final Fantasy commander to use in a spellslinger deck, but Kuja, Genome Sorcerer is arguably just as viable for anyone looking to craft a Rakdos deck instead of an Izzet one
The last time I even knew of a shop that could get one was in 2006